'Is It Lawful' in the Bible

And he saith unto them, Is it lawful to do good on the sabbath days, or to do evil? to save life, or to kill? But they held their peace.

And the Pharisees came to him, and asked him, Is it lawful for a man to put away his wife? tempting him.

And when they were come, they say unto him, Master, we know that thou art true, and carest for no man: 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?