When the Messiah hears of the great suffering of Israel in their dispersion, and of the wicked amongst them who seek not to know their Master, he weeps aloud on account of those wicked ones amongst them, as it is written: “But he was wounded because of our transgression, he was crushed because of our iniquities” (Ibid. LIII, 5). The souls then return to their place. The Messiah, on his part, enters a certain Hall in the Garden of Eden, called the Hall of the Afflicted. There he calls for all the diseases and pains and sufferings of Israel, bidding them settle on himself, which they do. And were it not that he thus eases the burden from Israel, taking it on himself, no one could endure the sufferings meted out to Israel in expiation on account of their neglect of the Torah. So Scripture says; “Surely our diseases he did bear”, etc. (Ibid. LIII, 4).
Soncino Zohar, Shemoth, Section 2, p.212a.