'Necessary' in the Bible

Then Paul and Barnabas without fear said, It was necessary for the word of God to be given to you first; but because you will have nothing to do with it, and have no desire for eternal life, it will now be offered to the Gentiles.

But some of the Pharisees, who were of the faith, got up and said, It is necessary for these to have circumcision and to keep the law of Moses.

For it seemed good to the Holy Spirit and to us, to put on you nothing more than these necessary things;

You yourselves have seen that with these hands I got what was necessary for me and those who were with me.

Go with these, and make yourself clean with them, and make the necessary payments for them, so that they may be free from their oath: and everyone will see that the statements made about you are not true, but that you put yourself under rule, and keep the law.

Then Paul took the men, and on the day after, making himself clean with them, he went into the Temple, giving out the statement that the days necessary for making them clean were complete, till the offering was made for every one of them.