וַיָּ֤שֶׂם הָעֶ֙בֶד֙ אֶת־יָד֔וֹ תַּ֛חַת יֶ֥רֶךְ אַבְרָהָ֖ם אֲדֹנָ֑יו וַיִּשָּׁ֣בַֽע ל֔וֹ עַל־הַדָּבָ֖ר הַזֶּֽה׃
Entonces el criado puso su mano debajo del muslo de Abraham su señor, y juróle sobre este negocio.
Targum Jonathan on Genesis
And the servant put his hand upon the circumcised part of Abraham his lord, and sware to him according to this thing.