Reference for Deuteronomy 33:15

וּמֵרֹ֖אשׁ הַרְרֵי־קֶ֑דֶם וּמִמֶּ֖גֶד גִּבְע֥וֹת עוֹלָֽם׃

And for the tops of the ancient mountains, And for the precious things of the everlasting hills,