And thus do you find with the men of the tower (of Bavel), that You gave them a grace period for repentance and they did not repent. As it is written (Ibid. 11:6) "Behold, they are one people, and all of them have one language, and this is what they begin to do! And now, etc. "Now" connotes (an opening for) repentance, viz. (Devarim 10:12) "And now, O Israel, what does the L–rd your G–d ask of you" (but to repent). And You did not decree destruction upon them (the men of the tower) until they had consummated their evil before You.