Deuteronomy 11:29

ונתת את הברכה THEN THOU SHALT PUT THE BLESSING [UPON MOUNT GERIZIM] — Understand this as the Targum renders it: ית מברכיא those who pronounce the blessing. על הר גרזים means “towards Mount Gerizim”: they (the Levites) turned their faces towards it and began with a formula of blessing: “Blessed be the man that doth not make any graven or molten image etc.”. For each of the paragraphs beginning with the expression ארור as set forth in the chapter (Deuteronomy 27), they first recited in a converse form, beginning with the expression ברוך, “Blessed be etc.” and only afterwards did they turn their faces towards Mount Ebal and began to recite the corresponding curse (Sifrei Devarim 55:2; Sotah 32a; cf. Rashi on Deuteronomy 27).

וְהָיָ֗ה כִּ֤י יְבִֽיאֲךָ֙ יְהֹוָ֣ה אֱלֹהֶ֔יךָ אֶל־הָאָ֕רֶץ אֲשֶׁר־אַתָּ֥ה בָא־שָׁ֖מָּה לְרִשְׁתָּ֑הּ וְנָתַתָּ֤ה אֶת־הַבְּרָכָה֙ עַל־הַ֣ר גְּרִזִ֔ים וְאֶת־הַקְּלָלָ֖ה עַל־הַ֥ר עֵיבָֽל׃

And it shall come to pass, when the Lord thy God has brought thee in to the land into which thou dost go to possess it, that thou shalt put the blessing upon mount Gerizzim, and the curse upon mount ῾Eval.