Rashi on Exodus 34:9/רש"י על שמות ל״ד:ט׳

1ילך נא אדני בקרבנו LET MY LORD, I PRAY THEE, GO AMONG US as Thou hast promised (cf. Exodus 33:14), since Thou forgivest iniquity. And even if it be a stiff-necked people and they have rebelled against Thee and Thou didst on that account say, (Exodus 30:3) “lest I consume thee in the way” — yet pardon Thou our iniquity etc. — כי is sometimes used in place of (in the sense of) אם, “if”.

2ונחלתנו. AND TAKE US FOR THINE INHERITANCE — make us a special inheritance unto Thyself. This is the same request as that contained in (Exodus 33:16) “that we should be different, I and thy people [from all other peoples]” — which means that You should not let Your Shechinah rest upon the other peoples of the world (cf. Rashi on this verse).