'Necessary' in the Bible

And when the necessary days for making them clean by the law of Moses had come to an end, they took him to Jerusalem to give him to the Lord

And they all gave reasons why they were not able to come. The first said to him, I have got a new field, and it is necessary for me to go and see it: I am full of regret that I am unable to come.

And he said to his disciples, It is necessary for causes of trouble to come about, but unhappy is he by whom they come.

Was it not necessary for the Christ to go through these things, and to come into his glory?

And he said to them, These are the words which I said to you when I was still with you, how it was necessary for all the things which are in the writings of Moses and the prophets and in the Psalms about me, to be put into effect.