'Is It Lawful' in the Bible

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

And they come and say to him, Teacher, we know that thou art true, and carest for no one; for thou regardest not the person of men, but teachest the way of God in truth. Is it lawful to give tribute to Caesar, or not?