Reference for Chullin 182:21

וכולן נבלעו באחד

At least two were ascending and two descending, and when they met each other [on the ladder] there were four; and of an angel it is written: His body was like the Tarshish,<span class="x" onmousemove="('comment',' Dan. X, 6. usually translated 'beryl' or some other precious stone. According to Rabbinic tradition it is the name of a sea which extends for two thousand parasangs (Persian miles) . V. Jonah I, 3. Rashi (on Dan. ibid.) identifies it with the sea of Africa; probably the Mediterranean Sea.');">⁹</span>

Akdamut Milin

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