'Is It Lawful' in the Bible

And, behold, there was a man having the hand withered. And they asked him saying, Is it lawful to cure in the sabbaths? that they might expose him.

And the Pharisees came to him, tempting him, and saying to him, Is it lawful for a man to loose his wife for every cause

Therefore say to us, What seems to thee Is it lawful to give tribute to Caesar, or not?