“For everything there is a season, and a time for every purpose under the heavens” (Ecclesiastes 3:1). There was a time for Adam the first man to enter the Garden of Eden, as it is stated: “He placed him in the Garden of Eden” (Genesis 2:15). And there was a time to depart from there, as it is stated: “He banished the man…” (Genesis 3:24). There was a time for Noah to enter the ark, as it is stated: “Come…to the ark” (Genesis 7:1).
And there was a time to emerge from there, as it is stated: “Emerge from the ark” (Genesis 8:16). There was a time for the [mitzva of] circumcision to be given to Abraham, as it is stated: “You shall observe My covenant” (Genesis 17:9). And there was a time for his descendants to be circumcised, [and for many] of them to be circumcised [at once. This occurred] in two places, once in Egypt and once in the wilderness, as it is stated: “All the people who departed were circumcised [and all the people born in the wilderness…were not circumcised]” (Joshua 5:5).1Joshua saw to their circumcision.
“And a time for every purpose under the heavens” – there was a time for the Torah to be given to Israel. Rav Beivai said: It was time for a certain thing that was located above the heavens to now be given under the heavens. What is that? It is the Torah, as it is stated: “God spoke all these matters, saying” (Exodus 20:1).