Genesis 32:25 in the King James Version
And when he saw that he prevailed not against him, he touched the hollow of his thigh; and the hollow of Jacob’s thigh was out of joint, as he wrestled with him.
Context
24 Jacob was left alone, and wrestled with a man there until the breaking of the day.
25 When he saw that he didn’t prevail against him, the man touched the hollow of his thigh, and the hollow of Jacob’s thigh was strained as he wrestled.
26 The man said, “Let me go, for the day breaks.” Jacob said, “I won’t let you go unless you bless me.”