Bible Verses About Oaths: Often accompanied by placing the hand under the thigh of the person sworn to

Avraham said to the servant who had served him the longest, who was in charge of all he owned, "Put your hand under my thigh;

The servant put his hand under the thigh of Avraham his master and swore to him concerning the matter.

The time came when Isra'el was approaching death; so he called for his son Yosef and said to him, "If you truly love me, please put your hand under my thigh and pledge that, out of consideration for me, you will not bury me in Egypt.