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)
"Passem pelo meio do acampamento e ordenem ao povo, dizendo: 'Preparem suas provisões, pois dentro de três dias vocês atravessarão este Yarden para entrar e tomar posse da terra que Hashem, seu Deus, dá a vocês para herdarem.'"
Rashi
Prepare your travel needs. [Prepare] everything necessary for (traveling) and weapons for the [upcoming] battle, he said to them. You cannot say the צֵדָה refers to food and drink20Metsudas Dovid maintains that while they still ate of the manna, they bought other varieties of food from the non-Jewish merchants, and it was these foods that they were commanded to prepare. for they had sufficient manna in their vessels to last them untill the sixteenth of Nissan, and so it is said:21Chapter 5:12. ‘The manna ceased on the morrow.’
Rashi
After three days. At the end of three days. When you will have been here three days; then you will cross [the Jordan].