Shiva Purana
प्रसादमतुलं कर्तुं पुरा दत्तवरस्तयोः ॥ आगच्छत्तत्र यत्रेमौ ब्रह्मनारायणौ स्थितौ ॥ ४५ ॥
In the past he had given them a boon to show them incomparable grace. He came to the place where these two Brahma and Narayana were standing.
english translation
prasAdamatulaM kartuM purA dattavarastayoH ॥ Agacchattatra yatremau brahmanArAyaNau sthitau ॥ 45 ॥
hk transliteration by Sanscript