I've Heard some people try to make the claim that since Jesus died on the cross we no longer need to keep the commandments or the law. IT IS SIMPLY NOT TRUE.
Jesus instructed his apostles NOT TO SIN, and he, of all people, knew of the role he was going to fill [with regard to salvation].
17Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
19Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.