A scholar Anurag Singh has stated that Guru Gobind Singh’s salok is referenced in over 300 puratan (older) handwritten Sri Guru Granth Sahib Ji manuscripts. It was generally believed that Sri Guru Gobind Singh Sahib Ji did have a salok in Sri Guru Granth Sahib Ji but the evidence was not provided until recent research of older manuscripts.
When Guru Gobind Singh Ji was enthroned as the tenth Guru, he completed the final version of the holy scriptures Sri Guru Granth Sahib Ji. Guru Gobind Singh Ji added the Shabads of the ninth Guru, Guru Tegh Bahadur Ji and one Salok (couplet) of his own to the Adi Granth.
Bhai Mani Singh Ji Shaheeds Bir of Sri Guru Granth Sahib Ji has the salok under the title of Patshahi Dasvin and Baba Deep SIngh Ji’s bir has the salok under mahalla 10.
All the puratan birs have the salok under Guru Gobind Singh Ji’s name as explained in the Samparda steeks and sants katha. Faridkot Teeka which took 12 years in creating also provides information that the salok is attributed to Sri Guru Granth Sahib Ji.
“END OF SALOK MAHALLA 9 – BAL HOA BANDAN CHUTEH SAB KICH HOT UPAIYE NANAK SAB KICH TUMRE HAATH ME TUM HE HOT SAHAIE
THIS IS GURU GOBIND SINGHS SHABAD”
Evidence in Historic Birs Saroops:
Fast forward to minute 30:00 to listen to the historical context: