וַיֹּ֥אמֶר אַבְרָ֖ם אֶל־מֶ֣לֶךְ סְדֹ֑ם הֲרִימֹ֨תִי יָדִ֤י אֶל־יְהוָה֙ אֵ֣ל עֶלְי֔וֹן קֹנֵ֖ה שָׁמַ֥יִם וָאָֽרֶץ׃
Abram répondit au roi de Sodome: "Je lève la main devant l’Éternel, qui est le Dieu suprême, auteur des cieux et de la terre;
Zohar
Moreover, the spirit of impurity rests on such hands, for it is wont to hover over an empty spot, and blessing does not rest there. Thus the hand must be lifted up to heaven only as an expression of prayer or of blessing.