'Necessary' in the Bible

And he began to teach them that it was necessary [for] the Son of Man to suffer many [things] and to be rejected by the elders and the chief priests and the scribes, and to be killed, and after three days to rise.

But he kept saying emphatically, "If it is necessary for me to die with you, I will never deny you!" And they all were saying the same [thing] also.