But when they had commanded them to go aside out of the council, they {k} conferred among themselves,

(k) Laid their heads together.

People's New Testament

4:15 When they had commanded them to go aside. They sent them from their presence in order that they might confer freely together. The substance of their deliberations is condensed and reported. The conclusion they arrived at was, not to punish them for a miracle that all the people knew had taken place, but to stop their preaching by threats.

Matthew Henry's Concise Commentary

4:15-22 All the care of the rulers is, that the doctrine of Christ spread not among the people, yet they cannot say it is false or dangerous, or of any ill tendency; and they are ashamed to own the true reason; that it testifies against their hypocrisy, wickedness, and tyranny. Those who know how to put a just value upon Christ's promises, know how to put just contempt upon the world's threatenings. The apostles look with concern on perishing souls, and know they cannot escape eternal ruin but by Jesus Christ, therefore they are faithful in warning, and showing the right way. None will enjoy peace of mind, nor act uprightly, till they have learned to guide their conduct by the fixed standard of truth, and not by the shifting opinions and fancies of men. Especially beware of a vain attempt to serve two masters, God and the world; the end will be, you can serve neither fully.