עִבְר֣וּ ׀ בְּקֶ֣רֶב הַֽמַּחֲנֶ֗ה וְצַוּ֤וּ אֶת־הָעָם֙ לֵאמֹ֔ר הָכִ֥ינוּ לָכֶ֖ם צֵידָ֑ה כִּ֞י בְּע֣וֹד ׀ שְׁלֹ֣שֶׁת יָמִ֗ים אַתֶּם֙ עֹֽבְרִים֙ אֶת־הַיַּרְדֵּ֣ן הַזֶּ֔ה לָבוֹא֙ לָרֶ֣שֶׁת אֶת־הָאָ֔רֶץ אֲשֶׁר֙ יְהוָ֣ה אֱלֹֽהֵיכֶ֔ם נֹתֵ֥ן לָכֶ֖ם לְרִשְׁתָּֽהּ׃ (ס)
"Parcourez le camp et communiquez cet ordre au peuple: Munissez-vous de provisions; car, encore trois jours, et vous passerez ce Jourdain pour marcher à la conquête du pays que l’Éternel, votre Dieu, vous donne en possession."
Kiddushin
and it is written, "'Go through the midst of the camp and command the people, saying "Prepare provisions for yourselves, since in another three days, you will cross the Jordan"'"; and it is written (Joshua 4:19), "And the people ascended from the Jordan on the tenth of the first month." Take away from [this time] thirty three days retroactively - behold, you have learned that Moshe died on the seventh of Adar!