Matsyapurana 21.26

21.26

vṛddhadvijo yastadvākyāt sarvaṃ jñāsyasyaśeṣataḥ
ityuktvāntardadhe viṣṇuḥ prabhāte 'tha nṛpaḥ purāt //

"What more disgrace can there be than this." Hearing those words of the queen the king became speechless. In order to please the queen the king observed a penance and began to worship Lord Viṣṇu without tasting any food for a week. The God appeared to him in a dream and said "you will come across an old Brâhmaṇa to-morrow in course of your rambles in the town and you must acquaint yourself with everything from him." Saying that the Lord vanished.—24-26.