וַיֵּרָ֤א אֵלָיו֙ יְהוָ֔ה וַיֹּ֖אמֶר אַל־תֵּרֵ֣ד מִצְרָ֑יְמָה שְׁכֹ֣ן בָּאָ֔רֶץ אֲשֶׁ֖ר אֹמַ֥ר אֵלֶֽיךָ׃
And the LORD appeared unto him, and said: ‘Go not down unto Egypt; dwell in the land which I shall tell thee of.
Read halakhic rulings (Jewish law) on Genesis 26:2: and classical halakhic sources.