Acts 4:18

‘And they called them, and charged them not to speak at all nor teach in the name of Jesus.'

The final communication was now made of their decision. This would have been in the form of an official admonition before witnesses. The men were not to speak at all or teach in the name of Jesus. It was not a sentence on them. It was a clarification of the situation. It was possibly understandable as ‘unlearned' men that they had not quite realised that Jesus was not someone whose teaching was approved of. But now let there be no more of it. They were receiving an official warning. If they preached in His Name they incurred His guilt.