We always need the Ten Commandments. God wrote them on stone to signify permanence. The ark in Heaven (Rev. 11:19) has a copy. It was instituted at Creation and will be observed throughout eternity.
But look at what JAMES told Paul what to do on his last trip to Jerusalem.
Thou seest, brother, how many thousands of Jews there are which believe; and they are all zealous of the law: 21And they are informed of thee, that thou teachest all the Jews which are among the Gentiles to forsake Moses, saying that they ought not to circumcise their children, neither to walk after the customs. 22What is it therefore? the multitude must needs come together: for they will hear that thou art come. 23Do therefore this that we say to thee: We have four men which have a vow on them; 24Them take, and purify thyself with them, and be at charges(Pay ort heir sacrifices) with them, that they may shave their heads: and all may know that those things, whereof they were informed concerning thee, are nothing; but that thou thyself also walkest orderly, and keepest the law. 25As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication. 26Then Paul took the men, and the next day purifying himself with them entered into the temple, to signify the accomplishment of the days of purification, until that an offering should be offered for every one of them.
Paul Seized in the Temple
27And when the seven days were almost ended, the Jews which were of Asia, when they saw him in the temple, stirred up all the people, and laid hands on him, 28Crying out, Men of Israel, help: This is the man, that teacheth all men every where against the people, and the law, and this place: and further brought Greeks also into the temple, and hath polluted this holy place. 29(For they had seen before with him in the city Trophimus an Ephesian, whom they supposed that Paul had brought into the temple.) 30And all the city was moved, and the people ran together: and they took Paul, and drew him out of the temple: and forthwith the doors were shut.