Matsya Purana 227.38

227.38

asthimatāñca satvānāṃ sahasrasya pramāpaṇe.
pūrṇevānasya vasthātuṃ śūdrahatyā vratañcaret .. 227.37 ..

If a Kṣatriya abuses a Vaiśya he would be fined 50 Panas, and if he abuses a Sudra he should be fined 25 Panas ! If a Śuudra abu To purify himself of such a sin one should observe the Śūdrahatyā ordinance and should also make some gift to a Brâhmaṇa in case of killing animals having bones. One becomes purified of the sin of killing boneless insects, etc., merely by Prâṇâyâma.—37-38