Matsya Purana 58.6

58.6

prāpya pakṣaṃ śubhaṃ śuklamatīte cottarāyaṇe.
puṇye'hni viprakathite kṛtvā brāhmaṇavācanam.. 58.5 ..

The Lord Fish said:—Hear, O Mighty-armed, the rules about tanks, etc., as laid down in the Itihâsa and the Purâṇas, by knowers of the Veda. At the end of the summer solstice, the man performing the ceremony should get the preparatory rites to the observance performed in an auspicious bright fortnight, after consulting a Brâhmaṇa.—4-5.