כִּ֧י אֶת־כָּל־הָאָ֛רֶץ אֲשֶׁר־אַתָּ֥ה רֹאֶ֖ה לְךָ֣ אֶתְּנֶ֑נָּה וּֽלְזַרְעֲךָ֖ עַד־עוֹלָֽם׃
for all the land which thou seest, to thee will I give it, and to thy seed for ever.
Read kabbalistic (mystical) interpretation of Genesis 13:15: and classical mystical sources.