Hanuman is considered the foremost devotee of Lord Rama. Whenever the story of Rama is narrated, Hanuman would be present.
Whoever recites the Hanuman Chalisa (40 stanzas in Hindi praising Hanuman), written by Tulsidas, for 40 mornings, will realise health, wealth, happiness, courage, valour and wisdom. Devotees reciting this chalisa 108 times will overcome all obstacles.
Whenever someone is in distress, if they recite the Hanuman Chalisa, they would be protected from all enemies.
Here is the Hanuman Chalisa sung by MS Subbulakshmi.
Shree Guru Charan Saroj Raj, Nij Man Mukar Sudhari,
Barnau Raghuvar Bimal Jasu, Jo dayaku Phal Chari
After cleansing the mirror of my mind with the pollen dust of holy Guru's Lotus feet. I Profess the pure, untainted glory of Rama which bestows the four-fold fruits of life (truth, wealth, pleasure and liberation).
Budhi heen Tanu Janike, Sumirow, Pavan Kumar,
Bal Buddhi Vidya Dehu Mohi, Harahu Kalesh Bikaar
Fully aware of the deficiency of my intelligence, I concentrate my attention on the Son of Wind and humbly ask for strength, intelligence and true knowledge to relieve me of all blemishes, causing pain.
Jai Hanuman Gyan Guna Sagar
Jai Kapis Tihun Lok Ujgaar
Victory to thee, O Hanuman! Ocean of Wisdom, Hail the fountainhead of power, wisdom and Shiva-Shakti, You illuminate the entire cosmos with your glory.
Ramdoot Atulit Bal Dhamaa,
Anjani Putra Pavansut naamaa
You, the Divine messager of Ram and repository of immeasurable strength, are also known as the Son of Anjani and Son of Wind
Mahebeer Bikram Bajrangi,
Kumati Nivaar Sumati Ke Sangi
You are valiant and brave, with a body like lightening. You are the dispeller of darkness of evil thoughts and companion of good sense and wisdom.
Kanchan Baran Biraaj Subesaa,
Kanan kundal kunchit kesa
Your body is golden coloured. Your garment is beautiful, rings on your ears, hair long and curly.
Hath Bajra Aur Dhvaja Birjai,
Kandhe Moonj Janeu saage
You hold in one hand a lighting bolt and in the other a banner with the sacred thread across your shoulder.
Shankar Suvna Kesari Nandan,
Tej Pratap Maha Jag Vandan
As a descendant of Shiva, you are a comfort and pride of Kesari. With the lustre of your vast sway, you are propitiated all over the universe.
Vidyavaan Guni Ati Chatur,
Ram Kaj Karibe Ko Atur
You are the repository of learning, virtuous, very wise and very keen to do the work of Rama.
Prabhu Charittra Sunibe Ko Rasiya,
Ram Lakhan Sita man basyia
You are an ardent listener, always so keen to listen to the narration of Shri Ram's Life Stories. Your heart is filled with what Rama stands for. You therefore always dwell in the hearts of Rama, Lakshman and Sita.
Sukshma roop Dhari Siyahi Dikhwana,
Bikat roop Dhari Lank Jarawa
You appeared before Sita in a diminutive form and spoke to her, while you assumed an awesome form and struck terror by setting Lanka on fire.
Bhim roop Dhari Asur Sanhare,
Ramchandra Ke kaaj Savare
You, with a terrible form, killed demons in Lanka and performed all the work of lustrous Rama.
Laye Sajivan Lakhan Jiyaye,
Shri Raghubir harashi ur laye
When you brought life to Lakshman after bringing the Sanjivni herb, Rama took you in his deep embrace, his heart full of joy.
Raghupati Kinhi Bahut Badaai,
Tum Mama Priya Bharat Sam Bahi
Rama joyously extolled you excellence and remarked: "You are as dear to me as my own brother Bharat"
Sahastra Badan Tumharo Jas Gaave,
Asa kahi Shripati Kanth Laagave
Rama embraced you saying: "Let the thousand-tongued the cosmic serpent sing your glories"
Sankadik Brahmadi Muneesa,
Narad Sarad Sahit Aheesa
Sanak and the sages and saints, Lord Brahma, the great hermits Narada and Goddess Saraswati, along with the cosmic serpent, all fail to sing your glories adequately.
Jam Kuber Digpal Jahan Te,
Kabi Kabid Kahin Sake Kahan Te
Let alone the denizens of earth like poets and scholars, even gods like Yamraj, Kuber, and Digpal fail to sing adequately in praise of your greatness.
Tum Upkar Sugrivahi Keenha,
Ram Miali Rajpad Deenha
You rendered a great service for Sugriva, It was you who united him with Rama and installed him on the royal throne.
Tumharo Mantro Bibhishan Maana,
Lankeshwar Bhaye Sab Jag Jaana
By heeding your advice. Vibhishan became Lord of Lanka, which is known all over the universe.
Juug Sahastra Jojan Par Bhaanu,
Leelyo Taahi Madhur Phal Jaanu
You gulped the sun from a distance of sixteen thousand miles considering it to be a sweet fruit.
Prabhu Mudrika Meli Mukha Maaheen,
Jaladhi Langhi Gaye Acharaj Naheen
Carrying the Lord's ring in your mouth, you went across the ocean. There is no wonder in that.
Durgam Kaaj Jagat Ke Jeete,
Sugam Anugrah Tumhre Te Te
All the difficult tasks in the world are rendered easiest by your grace.
Ram Duware Tum Rakhavare,
Hot Na Aagya Bin Paisare
You are the sentry at the door of Rama’s divine Abode.No one can enter it without your permission.
Sab Sukh Lahen Tumhari Sarna,
Tum Rakshak Kaahu Ko Darnaa
By your grace one can enjoy all happiness and one need not have any fear under your protection.
Aapan Tej Samharo Aapei,
Tanau Lok Hank Te Kanpei
When you roar all the three worlds tremble and only you can control your might.
Bhoot Pisaach Nikat Nahi Avei,
Mahabir Jab Naam Sunavei
Oh brave one! Your name keeps all the ghosts, demons and evils spirits away from your devotees.
Nasei Rog Hare Sab Peera,
Japat Niranter Hanumant Beera
On reciting Hanuman’s holy name regularly all the maladies perish, all pain disappears.
Sankat Te Hanuman Chhudavei,
Man Kram Bachan Dhyan Jo Lavei
Those who rembember Hanuman in thought, word and deed are well guarded against their odds in life.
Sab Par Ram Tapasvee Raaja,
Tinke Kaaj Sakal Tum Saaja
You are the caretaker of even Rama, who has been hailed as the supreme Lord and the monarch among all those devoted in penances.
Aur Manorath Jo Koi Lave,
Soi Amit Jivan Phal Pave
You fulfill the desires of those who come to you and bestow the eternal nectar, the highest fruit of life.
Charo Juung Partap Tumhara,
Hai Parsiddha Jagat Ujiyara
Your magnificent glory is acclaimed far and wide all through the four ages and your fame is radiant all over the cosmos.
Sadho Sant Ke Tum Rakhvare,
Asur Nikandan Ram Dulare
You are the saviour and the guardian angel of saints and sages and destroy all the demons, you are the seraphic darling of Rama.
Ashta Siddhi Nau Nidhi Ke Data,
Asa Bar Din Janki Mata
You have been blessed with mother Janaki to grant to any one any yogic power of eight sidhis and nine nidhis as per choice.
Ram Rasayan Tumhare Pasa,
Sadaa Raho Raghupati Ke Dasa
You hold the essence of devotion to Rama, always at his service.
Tumhare Bhajan Ramko Pavei.
Janam Janam Ke Dukh Bisravei
Through devotion to you, one comes to Rama and becomes free from suffering of life after fife.
Anta Kaal Raghubar Pur Jai,
Jahan Janma Hari Bhakta Kahai
When the end came, you entered the eternal abode of Rama and remain his devotee, whenever you take a new birth on earth.
Aur Devata Chitt Na Dharai,
Hanumant Sei Sarva Sukh Karai
One need not hold any other deity in mind. Hanuman alone will give all happiness.
Sankat Kate Mitey Sab Peera,
Jo Sumirei Hanumant Balbeera
Oh powerful Hanuman! You end sufferings and remove all the pain of those who remember you.
Jai Jai Jai Hanuman Gosain
Kripa Karahu Gurudev Ki Naiee
Hail, Hail, Hail the Chief, Hanuman! I beseech you to bless me as my supreme Guru.
Jo Sat Baar Paath Kar Koi,
Chhutahi Bandi Maha Sukh Hoi
One who recites this Hanuman Chalisa one hundred times daily for one hundred days becomes free from the bondage of life and death and enjoys the highest bliss at last.
Jo Yah Padhe Hanuman Chalisa,
Hoy Siddhi Sakhi Gaurisa
Shiva is the witness, all those who recite Hanuman Chalisa regularly are sure to be receive benediction.
Tulsidas Sada Hari Chera,
Keeje Nath Hriday Mah Dera
Tulsidas, always the servant of the Lord, prays: "Oh my Lord! Be enshrined within my heart!
Pavan Tanay Sankat Haran, Mangal Murti Roop
Ram Lakhan Sita Sahit, Hriday Basahu Sur Bhoop
O Hanuman, Son of Wind, Saviour, embodiment of blessings, reside in my heart together with Rama, Laxman and Sita.
Here’s the Hanuman Chalisa from the animated film The Adventures of Hanuman.