'Necessary' in the Bible

From that time began Jesus to shew to his disciples that it is necessary for him to go away to Jerusalem, and to suffer many things from the elders, and chief priests, and scribes, and to be put to death, and the third day to rise.

Woe to the world because of stumbling blocks! It is necessary that stumbling blocks come, but woe to the person through whom they come.

"Woe to you, scribes and Pharisees--hypocrites!--because you pay a tenth of mint and dill and cumin, and neglect the more important [matters] of the law--justice and mercy and faithfulness! It was necessary to do these [things] {while not neglecting those}.

Peter saith to him, 'Even if it may be necessary for me to die with thee, I will not deny thee;' in like manner also said all the disciples.