Rashi on Exodus 32:34/רש"י על שמות ל״ב:ל״ד

1אל אשר דברתי לך OF WHICH I HAVE SPOKEN UNTO THEE — Here we have an instance of לך connected with the verb דבר being used in place of אליך (i. e. where לך actually means speaking to, not as its usual meaning it, speaking “concerning” someone or “in the interest of” someone as often pointed out by Rashi; cf. e. g., Rashi’s comment on Genesis 28:15). Similar is, (1 Kings 2:19) “to speak unto him (לדבר לו) for Adonijah” (cf. Rashi on that verse).

2הנה מלאכי BEHOLD, MINE ANGEL [SHALL GO BEFORE THEE] — My messenger, not Myself.

3וביום פקדי וגו׳ AND IN THE DAY WHEN I VISIT [I WILL VISIT THEIR SIN UPON THEM] — At present I listen to you and will refrain from consuming them all at once — but ever and ever throughout the ages, when I am visiting them for their sins I shall visit them at the same time for a little of this sin in addition to their other sins for which I am then punishing them. Indeed no punishment ever comes upon Israel in which there is not part payment for the sin of the golden calf (cf. Sanhedrin 102a).