What must I do? Three questions, three different answers.
Israel, before the cross Mat 19:16-21 And, behold, one came and said unto him, Good Master, what good thing shall I do, that I may have eternal life? 17 … but if thou wilt enter into life, keep the commandments. 18 He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness, 19 Honour thy father and thy mother: and, Thou shalt love thy neighbour as thyself. 20 The young man saith unto him, All these things have I kept from my youth up: what lack I yet? 21 Jesus said unto him, If thou wilt be perfect, go and sell that thou hast, and give to the poor, and thou shalt have treasure in heaven: and come and follow me. Before the cross, Jews had to show faith and confirming works (to prove their faith) in order to be saved. Their faith was placed in their confession of Jesus as the Messiah. Thereafter, their confirming works were to ob...