וַיֹּ֕אמֶר הִנֵּ֣ה שָׁמַ֔עְתִּי כִּ֥י יֶשׁ־שֶׁ֖בֶר בְּמִצְרָ֑יִם רְדוּ־שָׁ֙מָּה֙ וְשִׁבְרוּ־לָ֣נוּ מִשָּׁ֔ם וְנִחְיֶ֖ה וְלֹ֥א נָמֽוּת׃
און ער האָט געזאָגט: אָט האָב איך געהערט, אַז עס איז דאָ תּבואה אין מִצרַיִם. נידערט אַראָפּ אַהין, און קױפֿט אונדז אײַן פֿון דאָרטן, כּדי מיר זאָלן לעבן און ניט שטאַרבן.
Rashi
רדו שמה GO DOWN THITHER — He did not say to them לכו “Go ye” but רדו an allusion to the 210 years during which Israel was to be enslaved in Egypt corresponding to the numerical value of (רד״ו (210 (Genesis Rabbah 91:2).
Sforno
ונחיה, even if we cannot buy enough food to eat to our satisfaction, at least it will be enough not to die from the famine. This is why Yaakov added the words ולא נמות, “and we will not die.”
Or HaChaim
ונחיה ולא נמות. "so that we shall live and not die." The reason that Jacob repeated "so that we shall not die," was that negligence would be a capital sin for which an accounting would have to be given even in the Hereafter. On the other hand, if they made appropriate efforts to secure a supply of food, their lives in this world as well as in the Hereafter would be assured.