Midrash sur L’Exode 5:10

(Exod. 19:1:) ON THE THIRD NEW MOON. The Torah is threefold, its letters are threefold, the fathers are threefold, the tribe into whose hand it was given is threefold,²⁴“Levi” has three letters in Hebrew. Moses was {threefold from between them} [a third person between them], the letters of his <name> are threefold, <he was one of> three siblings, he was hidden for three moons, (according to Exod. 19:11) <it was> ON THE THIRD DAY <that the Holy One came down on Sinai >, and (here in Exod. 19:1:) ON THE THIRD NEW MOON <Israel arrived at Sinai>.²⁵Tanh., Exod. 5:10; PRK 12:13. The Torah (in the sense of Scripture) is threefold: Torah, Prophets, and Writings. Its letters are threefold: ABC. The fathers are threefold: Abraham, Isaac, and Jacob. Moses (MShH) was a third person <as a mediator> between them (in Deut. 5:5): I STOOD BETWEEN THE LORD AND YOU.²⁶Cf. Galatians 3:19–20. The letters <of his name> are threefold: M, Sh, <and> H. <He comes> from the third tribe: Reuben, Simeon, and Levi. <He was one of> three siblings: Moses, Aaron, and Miriam. He was hidden for three <moons> (according to Exod. 2:2): AND SHE HID HIM FOR THREE MOONS. (Exod. 19:11:) FOR ON THE THIRD DAY THE LORD WILL COME DOWN … <UPON MOUNT SINAI>, [even on the third new moon, as stated (in Exod. 19:1): ON THE THIRD NEW MOON.]