The Guru Granth Sahib (also known as the Adi Granth) is considered the Supreme Spiritual Authority and Head of the Sikh religion, rather than any living person. It is also the only scripture of its kind which not only contains the works of its own religious founders but also writings of people from other faiths. The book is held in great reverence by Sikhs and is treated as the living Guru of the Sikhs. Sikhism rejects idol worship, so the Guru Granth Sahib is not worshipped as an idol, but rather emphasis is placed on respect of the book for the writings which appear within. Guru Granth Sahib is a collection of devotional hymns and poetry which proclaims God, lays stress on meditation on the True Guru (God), and lays down moral and ethical rules for development of the soul, spiritual salvation and unity with God.

The sacred book of the Sikhs contains four poems of Trilochan, 62 of Namadeva and 240 Sakhis and 227 padas of Kabir. Most of the characteristic teachings of Sikhism like monotheism, crusade against idolatry and caste, externalism (bhaiachara) and ritualism could be easily traced to these saint poets, especially Kabir.

Grantha Sahib was composed in 1604 by Guru Arjan Dev with assistance of one of the great devotees by the name Bhai Gurdas. It was written in Gurmukhi Script so that the Sikhs may remain Guru-centred. Guru Grantha Sahib includes not only the compositions of Gurus but also of many Saint Poets. It includes verses of Ramanand, Jaideva, Namadeva, Trilochan, Veni, Dhanna, Pipa, Sain, Kabir, Rai Das, Shaikh Bhikhaji, Sadhna, Surdas, and Poona Nane and also some of Muslim Sufis.

Sri Guru Granth Sahib is beyond comparison. It is a Divine Treasure of synthetic embrace of the whole global community. The Holy book of the Sikhs is a paradise of spiritual harmony. True integration, harmony and unity can only usher in, on a solid foundation of Love. This Love stands out beautifully, harmoniously, synthetically in its pristine purity and glory in Sri Guru Granth Sahib.

The compositions of the Guru Granth Sahib, is of inestimable significance. It is all composed in mystic poetry. It is cast into 31 musical measures (Ragas). It is a natural flow of the divine ecstasy of Lovers of God. Language which has been used in Guru Granth Sahib is simple and easily understandable. Music is the medium of expression of deep spirituality. It is natural outcome and flow of religion of love. It transports others also to the realm of divinity.

Hence it can be concluded saying that Guru Granth Sahib serves as a living Guru for the Sikhs and helps them to walk in the right direction.