'Necessary' in the Bible

"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 said to him, "Even if it is necessary for me to die with you, I will never deny you!" And all the disciples said the same [thing].