All Israel are One Soul

Shelah Hakadosh, parshas Vayeshev

Know that all of Israel are called one soul and all of them together are called Adam...and just as the limbs of the body are one person, so it is that every single Jew is a single limb...there are differing levels of limbs--a brain, a heart, an eye, a hand, etc. -- and so, too, there are differing levels in Israel, one above the other which together make one man.