Midrash su Isaia 44:1

Thy right hand, O Lord (Exod. 15:6). This verse indicates that the Lord’s right hand is stretched out to receive repentant sinners. Though You set a time for the generation of the flood in which to do penance, as it is said: My spirit shall not abide in man forever (Gen. 6:3), You did not decree their destruction until they committed their most evil acts before You. Similarly, You set a time limit in which the men of the Tower of Babel were to repent, yet You did not decree their extinction until they performed their most wicked acts, as it is said: And now nothing will be withholden from them (ibid. 11:6). The expression and now is employed only to signify that they had an opportunity to repent, as is said: And now, Israel, what doth the Lord thy God require of thee? (Deut. 10:12); And now, O Israel, hearken unto the statutes (ibid. 4:1); And yet now hear, O Jacob (Isa. 44:1).