תּלמוד אויף בראשית 28:12

“And he dreamed, and behold! a ladder set up on the ground…” (Bereshit 28:12) A Tanna taught: What was the width of the ladder? Eight thousand parasangs, as it is written “…and behold, angels of God were ascending and descending upon it.” (ibid.) At least two were ascending and two descending, and when they met each other on the ladder there were four;