Leviticus 5:8

Lev 5:8 And he shall bring them unto the priest, who shall offer [that] which [is] for the sin offering first, and wring off his head from his neck, but shall not divide [it] asunder:

Ver. 8. For the sin offering first. ] For till sin be expiated, no sacrifice or service can be accepted. Therefore "Wash you, cleanse you," and then, "Come, and let us reason." Isa 1:16-18