הַעִידֹתִי֩ בָכֶ֨ם הַיּ֜וֹם אֶת־הַשָּׁמַ֣יִם וְאֶת־הָאָ֗רֶץ כִּֽי־אָבֹ֣ד תֹּאבֵדוּן֮ מַהֵר֒ מֵעַ֣ל הָאָ֔רֶץ אֲשֶׁ֨ר אַתֶּ֜ם עֹבְרִ֧ים אֶת־הַיַּרְדֵּ֛ן שָׁ֖מָּה לְרִשְׁתָּ֑הּ לֹֽא־תַאֲרִיכֻ֤ן יָמִים֙ עָלֶ֔יהָ כִּ֥י הִשָּׁמֵ֖ד תִּשָּׁמֵדֽוּן׃
מאַך איך הײַנט הימל און ערד עדות קעגן אײַך, אַז אונטערגײן װעט איר גיך אונטערגײן פֿון דעם לאַנד װאָס איר גײט אַריבער דעם יַרדן אַהין, עס צו אַרבן; איר װעט ניט מַאֲריך-יָמים זײַן דרינען, נײַערט פֿאַרטיליקט װעט איר פֿאַרטיליקט װערן.
Ibn Ezra
והאזיני And give ear. Sometimes verbs are derived from nouns, as האזיני, ‘give ear,’ from אׂזֶן ‘ ear.’ .There is in reality no difference between שמע ‘to hear’ and האזן ‘to give ear.’9By the additional phrase על דרך פשט in reality, the commentator indicates that he rejects the various remarks of the Midrash about the difference between Is. 1:1 and Deut. 32:1, and likewise the distinction drawn between the synonyms שמע and האזן. (See Yalkut ad locum).—Isaiah begins his prophecy, by addressing those witnesses, that have been pointed out to Israel by Moses, when he said I call heaven and earth to witness against you this day, that you shall soon utterly perish (Deut. 4:26); the time, foretold by Moses, had then come.
Rashi
for...is righteous for justice is with Him. Our Rabbis, however, explained that the Holy One, blessed be He, is charitable, and it is charity for us that He hastened and brought [the evil] two years before the numerical value of וַנוֹשַּׁנְתֶּם (Deut. 4:25): “and you will have grown old,” in order that [the curse of] “that you shall perish” should not be fulfilled with you. The numerical value of וַנוֹשַּׁנְתֶּם is 852, but they were exiled at the end of 850 [years] after their entry into the land.
Ramban
SEE, I HAVE SET BEFORE THEE THIS DAY LIFE AND GOOD, AND DEATH AND EVIL. He returns to exhort them yet again, to tell them that there are two courses in their hands and it is in their power to walk in whichever they desire, and there is no power below or above that will withhold them or stop them. And he calls heaven and earth to bear witness against them a second time,75Further, Verse 19. after he had said,I call heaven and earth to witness against you this day, that ye shall soon utterly perish,76Above, 4:26. for now he said, I call heaven and earth to witness against you this day, that I have set before thee life and death75Further, Verse 19. which are the blessing and the curse, and that I have counselled you that you should choose life, that hou mayest live, thou and thy seed.75Further, Verse 19. Thus he is now like someone who has the witnesses sign at the end of all his words.
Vayeilech
Vayeilech