פּירוש אויף שמות 34:9

ילך 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”.

אם נא מצאתי חן בעיניך ה' ילך נא ה׳ בקרבנו, “if I have indeed found favour in Your eyes o G-d, may the Lord walk among us, please.” The attribute Moses addresses in this verse is both times the attribute of His name spelled Adonai.” כי עם קשי עורף הוא, “although it is a stiffnecked people.” Moses concurred with G-d Who had described this people as “stiffnecked” in Exodus 33,3. G-d had used it as an excuse for not walking amongst that people. Moses uses this very fact as justifying his request that G-d remain present among them. What better restraining influence against the evil urge is there than the very presence of G-d, the Creator, being in its midst?An alternate explanation of this argument: “Even though they are a stiffnecked people.” We find the same logic in Psalms 25,11: וסלחת לעוני כי רב הוא, “forgive my sin even though it be great.” Why do I plead that You walk amongst us? Because the angel has no authority to forgive any trespasses against You, as You, Yourself have pointed out. It is therefore better that seeing that they are a stiff necked people, You should be there to forgive one sin of the people at a time, instead of letting them accumulate sins which, collectively, will prove too difficult to forgive.

אם נא מצאתי חן בעיניך....ילך נא אדו-ני בקרבנו, “if I have indeed found favour in Your eyes, .....may my Lord walk in our midst.” Moses argues that the very reason why it is so necessary for G–d personally to walk amongst the people is the problem that the people are so stiff-necked that they might countermand an angel’s instruction which would trigger G–d’s threat to annihilate them as we read in Exodus 33,13.