Judah Halevi,
Kitab al Khazari (Kuzari) — Part Four
“ A more exact and more lofty name is to be found in the form known as the Tetragrammaton. This is a proper noun, which can only be indicated by attributes, but has no location, and was formerly unknown. If He was commonly styled 'Elōhim,' the Tetragrammaton was used as special name. This is as if one asked: Which God is to be worshipped, the sun, the moon, the heaven, the signs of the zodiac, any star, fire, a spirit, or celestial angels, etc.; each of these, taken singly, has an activity and force, and causes growth and decay? ”
