The short answer
Sikhs follow Sri Guru Granth Sahib Ji as the Guru because the Gurus taught that the Guru is the Divine Word (Shabad), and because Guru Gobind Singh Ji, the tenth Guru, conferred Guruship on the scripture before he passed from this world. It contains the Bani of six Gurus and of Bhagats from many backgrounds, and it remains the living, final authority for Sikhs.
In detail
From the very beginning, the Sikh Gurus taught that the Guru is the Shabad, the Divine Word, rather than a physical body. The ten Gurus are understood as one light passing from one form to the next. Gurbani says plainly that the Bani is the Guru and the Guru is the Bani. When Sikhs bow to Guru Granth Sahib Ji, they are honouring that Word, which was always the true Guru.
The scripture has a history of careful preservation. Guru Arjan Dev Ji compiled the Adi Granth from the compositions of the earlier Gurus, his own Bani, and the Bani of Bhagats such as Kabir Ji, Farid Ji, Ravidas Ji and Namdev Ji, and installed it at Sri Harmandir Sahib in 1604. According to Sikh tradition, Guru Gobind Singh Ji later prepared a recension including the Bani of Guru Tegh Bahadur Ji. Historians and tradition agree that in 1708, at Nanded, Guru Gobind Singh Ji ended the line of human Gurus and conferred Guruship on the Granth.
This decision had profound results. The Guru could never again be claimed, bought or corrupted by a single person. Every Sikh — rich or poor, man or woman, from any caste or country — has equal access to the Guru. The Guru speaks in the same words to everyone, and anyone who can read or listen can learn directly. Alongside the Guru Granth, Sikh tradition speaks of the Guru Panth, the collective body of committed Sikhs guided by the Granth.
The content itself explains why it can be the Guru. Gurbani is a complete spiritual guide: it speaks of the One Creator, of Naam, of Hukam, of overcoming ego, of honest living, equality, courage and love. Its inclusion of Bhagats from Hindu and Muslim backgrounds, and from so-called low castes, shows that truth is not owned by any one group. Following Guru Granth Sahib Ji therefore means more than showing respect to a sacred book. It means reading, listening, understanding and allowing its teaching to have the final say in our lives.
What Gurbani says
ਬਾਣੀ ਗੁਰੂ ਗੁਰੂ ਹੈ ਬਾਣੀ ਵਿਚਿ ਬਾਣੀ ਅੰਮ੍ਰਿਤੁ ਸਾਰੇ ॥
Baanee guroo guroo hai baanee vich baanee amrit saare.
The Bani is the Guru, and the Guru is the Bani; within the Bani are all life-giving treasures.
ਬਾਣੀ ਗੁਰੂ ਹੈ, ਅਤੇ ਗੁਰੂ ਬਾਣੀ ਹੈ; ਬਾਣੀ ਵਿੱਚ ਜੀਵਨ ਦੇਣ ਵਾਲੇ ਸਾਰੇ ਖ਼ਜ਼ਾਨੇ ਹਨ।
Guru Ram Das Ji states that the Bani is the Guru and the Guru is the Bani.
ਆਗਿਆ ਭਈ ਅਕਾਲ ਕੀ ਤਬੀ ਚਲਾਇਓ ਪੰਥ ॥ ਸਭ ਸਿਖਨ ਕੋ ਹੁਕਮ ਹੈ ਗੁਰੂ ਮਾਨਿਓ ਗ੍ਰੰਥ ॥
Aagiaa bhaee akaal kee tabee chalaaio panth. Sabh sikhan ko hukam hai guroo maanio granth.
By the command of the Timeless One the Panth was established. All Sikhs are commanded to accept the Granth as the Guru.
ਅਕਾਲ ਪੁਰਖ ਦੇ ਹੁਕਮ ਨਾਲ ਪੰਥ ਚਲਾਇਆ ਗਿਆ। ਸਾਰੇ ਸਿੱਖਾਂ ਨੂੰ ਹੁਕਮ ਹੈ ਕਿ ਗ੍ਰੰਥ ਨੂੰ ਗੁਰੂ ਮੰਨਣ।
A traditional dohra (not part of Gurbani) recited after Ardas, expressing the Panth's acceptance of the Granth as Guru.
ਗੁਰਮੁਖਿ ਨਾਦੰ ਗੁਰਮੁਖਿ ਵੇਦੰ ਗੁਰਮੁਖਿ ਰਹਿਆ ਸਮਾਈ ॥
Gurmukh naadan gurmukh vedan gurmukh rahiaa samaaee.
Through the Guru comes the sacred sound; through the Guru comes true knowledge; through the Guru one realises the Divine present everywhere.
ਗੁਰੂ ਰਾਹੀਂ ਪਵਿੱਤਰ ਨਾਦ ਮਿਲਦਾ ਹੈ; ਗੁਰੂ ਰਾਹੀਂ ਸੱਚਾ ਗਿਆਨ ਮਿਲਦਾ ਹੈ; ਗੁਰੂ ਰਾਹੀਂ ਹੀ ਮਨੁੱਖ ਰੱਬ ਨੂੰ ਹਰ ਥਾਂ ਮੌਜੂਦ ਅਨੁਭਵ ਕਰਦਾ ਹੈ।
True knowledge comes through the Guru's Word.
What it means
The line from Guru Ram Das Ji is the foundation: the Guru and the Bani are one. Long before 1708, the Gurus were teaching that their Word was the Guru. The traditional dohra recited in many Gurdwaras after Ardas is not part of Gurbani itself, but it expresses the community's memory and commitment: the Panth accepts the Granth as the Guru. Together they show that Guruship of the scripture is both a spiritual truth and a historical decision.
Living it today
- Read or listen to at least one Shabad a day with its meaning, treating it as the Guru speaking to you.
- Take a daily Hukamnama (the Guru's order for the day) and reflect on one practical instruction in it.
- When unsure what Sikhi says about something, turn first to Gurbani rather than hearsay or social media.
- Learn a little of the history of the compilation so you can answer questions from friends with confidence.
A real-life example
Asking the Guru before a big move
Gurleen's family was deciding whether to move abroad for her father's job. Everyone had opinions — uncles, neighbours, cousins online. One evening her mother said, 'We've asked everyone except the Guru.' They sat together, listened to the day's Hukamnama from Sri Harmandir Sahib, and read its meaning. It did not tell them where to live, but it spoke of trusting the Divine and not being ruled by anxiety. 'The Guru doesn't give us a booking reference,' her father joked, 'but it tells us how to decide — calmly, honestly, and together.' Gurleen noticed that the arguments at home became gentler after that.
Common misunderstandings
Guru Granth Sahib Ji is only a holy book, like a book of rules.
For Sikhs it is the living Guru — the Divine Word that guides life — which is why it is treated with the honour due to the Guru.
Guru Granth Sahib Ji contains only the writings of Sikh Gurus.
It includes the Bani of six Gurus along with Bhagats and Bhatts from different religious and social backgrounds.
Respecting the Guru means only bowing and covering it with beautiful cloths.
Outward respect matters, but the Guru is truly followed when its teaching is read, understood and lived.
Sources
- Sri Guru Granth Sahib Ji, Ang 982
- Sikh Rehat Maryada, SGPC
- Sri Guru Granth Sahib Ji — full text