Judges 16:22

Howbeit, the hair of his head began to grow again after he was shaven. It began to grow immediately no doubt, as it naturally would do; but it is highly probable it grew in an extraordinary manner, and in a short time became as when it was shaved , as it may be rendered, and upon which his strength was renewed; not that his strength naturally lay in his hair, and so naturally increased as that grew; but he being made sensible of his sin, and repenting of it, renewed his Nazariteship, of which letting his hair grow was a token; and it pleased God, who accepted of his repentance as genuine, of his own good will and pleasure to renew his strength; particularly upon his prayer to him, after related.