Or HaChaim on Genesis 18:32/אור החיים על בראשית י״ח:ל״ב

1 אל נא יחר…אך הפעם. "Do not become angry if I speak only this one more time." Here Abraham again introduces his own merit as adequate to complement the quorum of twenty people (2 towns); this is why he worries about angering G'd. In this instance he was presumptuous enough to equate the protective power of his own merit with that of his Master. This is reflected in his avoidance of the words: "to my Lord;" he merely said: "I will speak," meaning a plea relying on his own merit. He added the word אך to indicate that he would not plead again if by chance the tenth one should be missing even in the remaining town.