CC Madhya 5.85

iṅhāra puṇye kṛṣṇe āni’ sākṣī bolāiba
tabe ei viprera satya-pratijñā rākhiba
Word for word: 
iṅhāra puṇye — by his piety; kṛṣṇe — Lord Kṛṣṇa; āni’ — bringing; sākṣī — witness; bolāiba — I shall call; tabe — at that time; ei viprera — of this brāhmaṇa; satya — truthful; pratijñā — the promise; rākhiba — I shall keep.
Translation: 
“By the piety of the elderly brāhmaṇa, I shall call the Supreme Personality of Godhead as a witness. Thus I shall keep his truthful promise intact.”