Put them in hold; some think this not to have been so strait a custody as that of a prison, but that rather the apostles were delivered to some who promised that they should be forthcoming. The prediction of our Saviour began now to be fulfilled, Luke 21:12. They shall lay their hands on you, and persecute you. Howsoever, God was pleased to suffer persecution to come by degrees on his church; after the sun was down, (Christ was gone from them), it was not presently pitch darkness with them. God always remembers his people's condition, and his own promise, and lays no more upon them than they are able to bear.
Related Commentaries of Acts 4:3
Acts 4:3
3 And they laid hands on them, and put them in hold unto the next day: for it was now eventide.