'Necessary' in the Bible

“Brothers and sisters, it was necessary that the Scripture be fulfilled, which the Holy Spirit foretold by the lips of David [king of Israel] about Judas [Iscariot], who acted as guide to those who arrested Jesus.

And [at the same time] Paul and Barnabas spoke out boldly and confidently, saying, “It was necessary that God’s message [of salvation through faith in Christ] be spoken to you [Jews] first. Since you repudiate it and judge yourselves unworthy of eternal life, now we turn to the Gentiles.

But some from the sect of the Pharisees who had believed [in Jesus as the Messiah] stood up and said, “It is necessary to circumcise the Gentile converts and to direct them to observe the Law of Moses.”

and after he brought them out [of the inner prison], he said, “Sirs, what must I do to be saved?”

explaining and pointing out [scriptural evidence] that it was necessary for the Christ to suffer and rise from the dead, and saying, “This Jesus, whom I am proclaiming to you, is the Christ (the Messiah, the Anointed).”

and said, ‘Stop being afraid, Paul. You must stand before Caesar; and behold, God has given you [the lives of] all those who are sailing with you.’