Matsyapurana 111.8

111.8

pañcayojanavistīrṇaṃ prayāgasya tu maṇḍalam
tiṣṭhanti rakṣaṇāyātra pāpakarmanivāraṇāt //

The circumference of Prayâga is five yojanas; owing to the absence of sin, Brahmâ resides towards the northern portion of the tîrtha to guard it, Viṣṇu stands personified in Veṇîmâdhava, and Śiva has fixed Himself in the form of the sacred banyan tree. Besides them, the Devas, the Gandharvâs, the ascetics and the seers guard the boundary of the holy place after driving away sin from there. It is the place where a man after getting rid of his sins does not see hell at all.—8-11.