'Hair of His Head' in the Bible

Then the army told Saul, "Shall Jonathan die, who brought about this great deliverance in Israel? As the LORD lives, not one hair of his head will fall to the ground, because today he did this with God's help."

"If he's done nothing wrong, not a hair of his head will be harmed," Solomon replied. "But if we find evil in him, he's a dead man."