וְהִנֵּ֨ה יְהוָ֜ה נִצָּ֣ב עָלָיו֮ וַיֹּאמַר֒ אֲנִ֣י יְהוָ֗ה אֱלֹהֵי֙ אַבְרָהָ֣ם אָבִ֔יךָ וֵאלֹהֵ֖י יִצְחָ֑ק הָאָ֗רֶץ אֲשֶׁ֤ר אַתָּה֙ שֹׁכֵ֣ב עָלֶ֔יהָ לְךָ֥ אֶתְּנֶ֖נָּה וּלְזַרְעֶֽךָ׃
And, behold, the LORD stood beside him, and said: ‘I am the LORD, the God of Abraham thy father, and the God of Isaac. The land whereon thou liest, to thee will I give it, and to thy seed.
Read halakhic rulings (Jewish law) on Genesis 28:13: and classical halakhic sources.