וַיֹּ֕אמֶר אָנֹכִ֥י הָאֵ֖ל אֱלֹהֵ֣י אָבִ֑יךָ אַל־תִּירָא֙ מֵרְדָ֣ה מִצְרַ֔יְמָה כִּֽי־לְג֥וֹי גָּד֖וֹל אֲשִֽׂימְךָ֥ שָֽׁם׃
And He said: ‘I am God, the God of thy father; fear not to go down into Egypt; for I will there make of thee a great nation.
Read kabbalistic (mystical) interpretation of Genesis 46:3: and classical mystical sources.