וַיֵּרָ֨א אֵלָ֤יו יְהוָה֙ בַּלַּ֣יְלָה הַה֔וּא וַיֹּ֕אמֶר אָנֹכִ֕י אֱלֹהֵ֖י אַבְרָהָ֣ם אָבִ֑יךָ אַל־תִּירָא֙ כִּֽי־אִתְּךָ֣ אָנֹ֔כִי וּבֵֽרַכְתִּ֙יךָ֙ וְהִרְבֵּיתִ֣י אֶֽת־זַרְעֲךָ֔ בַּעֲב֖וּר אַבְרָהָ֥ם עַבְדִּֽי׃
And the LORD appeared unto him the same night, and said: ‘I am the God of Abraham thy father. Fear not, for I am with thee, and will bless thee, and multiply thy seed for My servant Abraham’s sake.’
Read kabbalistic (mystical) interpretation of Genesis 26:24: and classical mystical sources.