'Necessary' in the Bible

Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.

For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things;

Who also honoured us with many honours; and when we departed, they laded us with such things as were necessary.