Genesis 24:2

Καὶ εἶπεν Ἀβραὰμ τῷ παιδὶ αὐτοῦ, τῷ πρεσβυτέρῳ τῆς οἰκίας αὐτοῦ, τῷ ἄρχοντι πάντων τῶν αὐτοῦ· Θὲς τὴν χεῖρά σου ὑπὸ τὸν μηρόν μου,

And Abraam said to his servant, the elder of his household, who had rule over all that was his, “Put your hand under my thigh,

ויאמר אברהם אל־עבדו זקן ביתו המשׁל בכל־אשׁר־לו שׂים־נא ידך תחת ירכי׃