There are three places in the Pentateuch that forbid the Israelites to come back to Egypt, after they left it. The first is in Exodus 14:13- ” וַיֹּאמֶר מֹשֶׁה אֶל-הָעָם, אַל-תִּירָאוּ–הִתְיַצְּבוּ וּרְאוּ אֶת-יְשׁוּעַת יְהוָה, אֲשֶׁר-יַעֲשֶׂה לָכֶם הַיּוֹם: כִּי, אֲשֶׁר רְאִיתֶם אֶת-מִצְרַיִם הַיּוֹם–לֹא תֹסִפוּ לִרְאֹתָם עוֹד, עַד-עוֹלָם” ” But Moses said to the people, “Do not fear [...]