Judges 16:17; Judges 16:20

17 So he told her everything. “No razor has ever been used on my head,” he said, “because I have been a Nazirite dedicated to God from my mother’s womb. If my head were shaved, my strength would leave me, and I would become as weak as any other man.”

20 Then she called, “Samson, the Philistines are upon you!” He awoke from his sleep and thought, “I’ll go out as before and shake myself free.” But he did not know that the LORD had left him.