'Is It Lawful' in the Bible

And he saith to them, 'Is it lawful on the sabbaths to do good, or to do evil? life to save, or to kill?' but they were silent.

and they having come, say to him, 'Teacher, we have known that thou art true, and thou art not caring for any one, for thou dost not look to the face of men, but in truth the way of God dost teach; is it lawful to give tribute to Caesar or not? may we give, or may we not give?'