וְהָיָ֗ה כַּאֲשֶׁ֨ר יָרִ֥ים מֹשֶׁ֛ה יָד֖וֹ וְגָבַ֣ר יִשְׂרָאֵ֑ל וְכַאֲשֶׁ֥ר יָנִ֛יחַ יָד֖וֹ וְגָבַ֥ר עֲמָלֵֽק׃
At nangyari, kapag itinataas ni Moises ang kanyang kamay, nananaig ang Israel; at kapag ibinababa niya ang kanyang kamay, nananaig ang Amalek.
Mishnah Rosh Hashanah
One who blows into a pit or a cistern or a jug, if he heard the sound of the shofar, he has fulfilled his obligation, but if he hears the echo [also], he has not fulfilled his obligation. And also one who was passing behind a synagogue or if his house was next to the synagogue and he heard the sound of the shofar or of the megillah [being read], if he directed his heart (had intention), then he has fulfilled his obligation, but if not he has not fulfilled his obligation. Even though this one heard and this one heard, this one directed his heart and this one did not.
Mishnah Rosh Hashanah
“And it came to pass, when Moses held up his hand Israel prevailed” etc. (Exodus 17:1. Did the hands of Moses wage war or break [Israel’s ability] to wage war? Rather this teaches that as long as Israel would look upwards and subject their hearts to their Father in heaven they prevailed, and if not they fell. Similarly, “Make for yourself a fiery serpent and mount it on a pole. And if anyone who is bitten shall look at it, he shall live” (Numbers 21:8). Did the serpent kill or did the serpent keep alive? Rather, when Israel would look upwards and subject their hearts to their Father in heaven, they were healed, and if not their [flesh] would melt away. A deaf-mute, a lunatic and a minor cannot cause others to fulfill their religious obligation. This is the general principle: one who is not himself obligated in the matter cannot perform it on behalf of others.