פּירוש אויף בראשית 18:21

ארדה נא I WILL GO DOWN NOW — This teaches the judges that they should not give decisions in cases involving capital punishment, except after having carefully looked into the matter — all as I have explained in the section dealing with the dispersion of the nations (11:5). Another explanation of ארדה נא is: I will go down to the very end of their doings (I will fathom the depths of their wickedness).

עשו כלה, the vertical line after the word עשו is like a comma between these words, i.e. “if they have done as reported, I will put an end to them.”

ארדה נא ואראה, we explained the meaning of G’d’s “descending” already on 11,5. This time the text says ואראה, “I shall see,” instead of לראות, “to see.” The Torah writes in this vein although we know that G’d is perfectly aware of all that goes on here on earth. The reason why the Torah describes G’d’s activity in this manner is only to remind people on earth that He is not in a hurry to mete out retribution, but is patient, and even when His patience is exhausted, He does not act impetuously, but is always in complete control. He examines if there is any way in which delaying retribution can be justified. It was this very phrase which provided Avraham with an opening to engage G’d in a dialogue concerning His Justice and man’s perception of Divine justice. He did this not because he doubted G’d’s justice, but in order to be able to teach man something about how G’d’s justice works.