Genesis 24:9

So the servant put his hand under the thigh of his master Abraham and swore an oath to him concerning this matter.

(New International Version)

So the servant placed his hand under the thigh of Abraham his master, and swore to him concerning this matter.

(New American Standard Bible)

And the servant put his hand under the thigh of Abraham his master, and sware to him concerning that matter.

(King James Version)