Matsyapurana 108.15

108.15

viśrambhaghātakānāṃ tu prayāge śṛṇu yatphalam
trikālameva snāyīta āhāraṃ bhaikṣyamācaret
tribhirmāsaiḥ sa mucyeta prayāge tu na saṃśayaḥ //

Hear what Prayâga does to a man who treacherously kills another. He undoubtedy frees himself from his sins by living on alms and bathing 3 times a day, for a period of three months.—15.