Another matter, “all the rivers go to the sea,” all Israel assembles only in Jerusalem and ascends [there] at the times of the festivals each and every year. “Yet the sea is not full,” but Jerusalem is never full, as we learned: “They stand crowded, but prostrate themselves with ample space” (Avot 5:5). Rabbi Shmuel bar Ḥova said in the name of Rabbi Aḥa: There were four cubits of space between each and every one, and a cubit on every side, so that one would not hear the prayer of another and become confused.48There were four cubits for each person when they would prostrate themselves, and one cubit between each person when they prayed (Midrash HaMevoar).
“To the place that the rivers go” – to the place that Israel assembles in this world, there they will assemble in the World to Come in the future, as it is stated: “It will be on that day, that a great shofar will be sounded; and the lost in the land of Assyria, and the dispersed in the land of Egypt will come and worship the Lord on the holy mountain in Jerusalem” (Isaiah 27:13).