Vaishnava Dharmashastra 54.30

54.30

avagūrya caret kṛcchram atikṛcchraṃ nipātane
kṛcchrātikṛcchraṃ kurvīta viprasyotpādya śoṇitam //

For attacking a Brâhmana (by raising a stick or a weapon against him), the Krikkhra (Prâgâpatya) penance must be performed; for striking him, the Atikrikkhra; and for fetching blood from him, the Krikkhrâtikrikkhra.