Skandapurana 2.5.18.15

2.5.18.15

14 dvādaśyāṃ matsyotsavamāhātmyavarṇanapūrvakasnānadānapūjādividhividhānakathanam, matsyotsave mantrajapavidhānam, snānasamaye nadīprārthanāmantrakathanam, bhagavate phalapuṣpādyarpaṇaphalakathanam, matsyarūpasvarṇamūrtidānamāhātmyavarṇanam. ... 205 2

14. Narration of the rules and injunctions for ablution, gift, worship, and so forth preceded by a description of the māhātmya of the Matsya festival on Dvādaśī; the rule for muttering mantras during the Matsya festival; narration of the prayer mantra to the river at the time of the bath; narration of the fruit of offering fruits, flowers, and the like to the Lord; description of the māhātmya of donating a golden image in the form of a fish. 205.2