וַיֹּאמַ֗ר יְהוָ֞ה מִסִּינַ֥י בָּא֙ וְזָרַ֤ח מִשֵּׂעִיר֙ לָ֔מוֹ הוֹפִ֙יעַ֙ מֵהַ֣ר פָּארָ֔ן וְאָתָ֖ה מֵרִבְבֹ֣ת קֹ֑דֶשׁ מִֽימִינ֕וֹ אשדת [אֵ֥שׁ] [דָּ֖ת] לָֽמוֹ׃
Y dijo: SEÑOR vino de Sinaí, Y de Seir les esclareció; Resplandeció del monte de Parán, Y vino con diez mil santos: A su diestra la ley de fuego para ellos.
Mishneh Torah, Prayer and the Priestly Blessing
Why does the worshiper bow towards the left, first? Because his left corresponds to the right of the person whom he faces. And just as one who stands before a king bows to the king's right and then to the king's left, so the sages ordained that at the conclusion of the Amidah, the same etiquette should be observed as in taking leave of the royal presence.
Sefer Chasidim
He who says to his friend, “Hand me a book” let him take it in his right hand and not in his left for the Torah was given with the right hand, as it is said (Deut. 33:2), “At His right hand was a fiery law unto them.” 1Sopherim 3:10.