From Agra Guru Tegh Bahadur visited Allahabad (Prayag). Here in addition to daily prayer and meditation, the great Guru Devoted himself to boundless charity, and humanitarian acts of piety. A joyful event took ~ace at Allahabad which thrilled the Devotees of the Guru. Here the divine mother Mata Gujri conceived the son of God.  

This event Guru Gobind Singh has himself described in his work "Apnikatha" (Autobiography) which forms the first book of his great historical epic "The Bachittar Natak"  

Gurdwara Tap Asthan (Pakki Sangat) - Allahabad is situated near the confluence of the River Ganga and Yamuna, which is sacred to the Hindus as Triveni Sangam (lit. confluence of three rivers) in the belief that a third invisible river Sarasvati also meets the Ganges here. Guru Nanak Dev visited Allahabad, then called by its old name Prayag. Guru Tegh Bahadur stayed here for some time. Gurudwara Tap Asthan (Pakki Sangat) Sri Guru Tegh Bahadur Ji in Mohalla Aihiyapur marks the site where the Guru stayed in the house of a Devotee. Its building reconstructed by Mahant Pritam Singh in 1965 stands about four feet above the street level. The sanctum is a flat-roofed rectangular congregation hall at the far end of a spacious square compound entered through a double-storey gateway. Guru Granth Sahib is seated on a canopied throne of while marble. One of the side rooms adjacent to the congregation hall represents the Guru's bedroom during his stay here. Two double-storey blocks of rooms, one on either side of the courtyard, provide residential accommodation to staff and visitors.