וַיָּ֤שֶׂם הָעֶ֙בֶד֙ אֶת־יָד֔וֹ תַּ֛חַת יֶ֥רֶךְ אַבְרָהָ֖ם אֲדֹנָ֑יו וַיִּשָּׁ֣בַֽע ל֔וֹ עַל־הַדָּבָ֖ר הַזֶּֽה׃
Então pôs o servo a sua mão debaixo da coxa de Abraão seu SENHOR, e jurou-lhe sobre este negócio.
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.