וְהָיָ֗ה כַּאֲשֶׁ֨ר יָרִ֥ים מֹשֶׁ֛ה יָד֖וֹ וְגָבַ֣ר יִשְׂרָאֵ֑ל וְכַאֲשֶׁ֥ר יָנִ֛יחַ יָד֖וֹ וְגָבַ֥ר עֲמָלֵֽק׃
E aconteceu que quando Moshe levantava sua mão, Israel prevalecia, e quando ele abaixava sua mão, Amalek prevalecia.
Kav HaYashar
Similarly, regarding Moshe’s prayer for the defeat of Amalek it is written, “And it came to pass that when Moshe raised his hand, Israel prevailed” (Shemos 17:11). However, this obligation to raise one’s hands only applies during prayer, the recitation of blessings or the expression of acknowledgement.” See the passage from the Zohar at length.