וַיִּבְכּוּ֩ בְנֵ֨י יִשְׂרָאֵ֧ל אֶת־מֹשֶׁ֛ה בְּעַֽרְבֹ֥ת מוֹאָ֖ב שְׁלֹשִׁ֣ים י֑וֹם וַֽיִּתְּמ֔וּ יְמֵ֥י בְכִ֖י אֵ֥בֶל מֹשֶֽׁה׃
I opłakiwali synowie Israela Mojżesza na stepach Moabu trzydzieści dni: i przeszły dni płaczu i żałoby po Mojżeszu.
Tosefta Sotah
And from where is it derived that Moses was born on the 7th of Adar? As it is said (Deut. 31:2), "And he said to them, I am 120 years old today," As there is [apparently] no need for the verse to state "today" (i.e., it could simply have said, "I am 120 years old"), what does "today" come to teach? That "today," his years became complete. Another version: What does "today" come to teach? It teaches that 120 years are precisely calculated from day to day. Another version, what does "today" come to teach? That the Holy One Blessed be He fulfills that which he gives to the righteous with goodwill and with happiness, as it is said (Ex. 23:26), "The number of your days I will complete." And from where is it derived that Moses died on the 7th of Adar? As it is said (Ex. 34:8), "And the Children of Israel wept over Moses in the Plains of Moab for thirty days, etc." And (Josh. 1:1), "And it was after the death of Moses, the servant of God, etc." And (Josh. 1:2) "Now arise and cross [the Jordan]." And (Josh. 1:10-11) "Joshua gave orders to the officers of the people, Pass through the camp [and instruct the people ... to be prepare to cross the Jordan in three days]." And it says (Josh. 4:19), "And the people arose from the Jordan on the tenth day of the first month, etc." Count backwards 33 [days] from that point (i.e., the 10th of Nissan), and it comes out that Moses died on the 7th of Adar.