Pehla Parkash · 1604
The first Parkash, at Sri Harmandir Sahib
By 1601 the Bani of four Gurus — carried forward as one volume, handed on with the Guruship itself — had reached Guru Arjan Dev Ji, along with the Bani of the Bhagats that Guru Nanak Dev Ji had gathered on his travels. Guru Arjan Dev Ji set about arranging that Bani: every composition placed under the raag it is sung in, spellings made consistent, and verses falsely circulating under Guru Nanak Dev Ji's name kept out.
He chose Bhai Gurdas Ji as scribe, and they worked at Ramsar, outside the town. What they finished in 1604 is the Adi Granth, also called Pothi Sahib — the form that would become Sri Guru Granth Sahib Ji. On 16 August 1604 the Adi Granth was carried to Sri Harmandir Sahib in a palanquin and installed. Baba Buddha Ji — who had known every Guru from Guru Nanak Dev Ji onward — was appointed the first Granthi. That is the first Parkash.