1 Chronicles 29:24

Heb. Put their hands under Solomon, i.e. they owned him for their king, and themselves for his subjects, and swore fealty to him; which possibly they now did after the ancient manner, with that ceremony of putting their hands under his thigh, which was used in swearing, Genesis 24:2, Genesis 47:29; or at least the thing is signified by a phrase taken from that practice formerly used, though now neglected; it being usual in all nations and languages to signify present things by phrases taken from ancient customs.