The Rabbis interpreted the verse regarding those who departed from Egypt. “Behold the bed [mitato],” his tribes [matotav] and his clans, just as it says: “The oaths of the tribes [matot]” (Habakkuk 3:9); “of Solomon [Shlomo],” of the king [of Whom it may be said] that peace [shalom] is His; “sixty valiant men,” these are the six hundred thousand who departed Egypt from twenty years of age and above; “from the valiant of Israel,” these are the six hundred thousand who departed Egypt from twenty years of age and below.
“Each armed with a sword, trained in war; each man, a sword on his thigh,” for when Moses said: ‘The Holy One blessed be He told me the following principle: “All uncircumcised shall not eat from it”’ (Exodus 12:48); immediately, each and every one took his sword on his thigh and circumcised himself. Who circumcised them? Rabbi Berekhya said: Moses was the circumciser, Aaron uncovered the skin,89After the foreskin is severed, one pulls back a thin membrane under it and uncovers the corona. and Joshua gave them to drink.
Some say: Joshua was the circumciser, Aaron uncovered the skin, and Moses gave them to drink; that is what is written: “At that time, the Lord said to Joshua: Make flint knives for yourself and circumcise the children of Israel again, a second time” (Joshua 5:2). Why “a second time”? From here [it may be derived] that he circumcised them the first time. Immediately, “Joshua made flint knives for himself, and circumcised the children of Israel at the Hill of the Foreskins” (Joshua 5:3).
What is “at the Hill of the Foreskins”? Rabbi Levi said: From here [it may be derived] that they made that hill out of foreskins.