כִּ֤י אַתֶּם֙ עֹבְרִ֣ים אֶת־הַיַּרְדֵּ֔ן לָבֹא֙ לָרֶ֣שֶׁת אֶת־הָאָ֔רֶץ אֲשֶׁר־יְהוָ֥ה אֱלֹהֵיכֶ֖ם נֹתֵ֣ן לָכֶ֑ם וִֽירִשְׁתֶּ֥ם אֹתָ֖הּ וִֽישַׁבְתֶּם־בָּֽהּ׃
װאָרום איר גײט אַריבער דעם יַרדן צו קומען אַרבן דאָס לאַנד װאָס ה׳ אײַער גאָט גיט אײַך, און איר װעט עס אַרבן, און זיך באַזעצן דרינען;
Rashi
כי אתם עברים את הירדן וגו׳ FOR YE SHALL PASS OVER THE JORDAN etc., — The miracles that will be wrought for you during your crossing of the Jordan shall be an omen for you that you will indeed come into and inherit the land (cf. Sifrei Devarim 57).
Ibn Ezra
The passage For you are crossing means: You are about to begin observing the commandments, whereby the land will become a permanent inheritance for you.
Siftei Chakhamim
The miracles at the Yardein, etc. Otherwise the verse should say, “You shall come to the land... you will inherit it... You will guard to fulfill, etc.” Furthermore, it already is written (v. 29), “When Adonoy ... has brought you.” If so then why is, “For you shall pass across,” needed? Rather [it indicates]: “The miracles, etc.”