“What shall we do with these men?” they asked. “Everyone in Jerusalem knows that this extraordinary miracle has been performed by them, and we cannot deny it.” (Acts 4:16, GNB)

The Jewish leaders who opposed Peter and John and their message and preaching, could hardly deny that a miracle had taken place because the man who had been healed was standing right alongside of Peter and John!

Did they ask the one who was healed what he thought?  Did they ask Peter and John where this great power to heal came from? [Peter helpfully informed them even thought they weren’t interested].  Did the display of miraculous power which they readily acknowledged had taken place make them stop for one minute and ask themselves if they were doing the wrong thing?  If perhaps this sign was for them?

No.  They did not.  They were spiritually blind.

Matthew Henry points out what they should have done:

If they would have yielded to the convincing commanding power of truth, it had been easy to say what they should do to these men. They should have placed them at the head of their council, and received their doctrine, and been baptized by them in the name of the Lord Jesus, and joined in fellowship with them. But, when men will not be persuaded to do what they should do, it is no marvel that they are ever and anon at a loss what to do.