פירוש על שמות 32:8

סרו מהר, they have strayed very quickly, etc. I have not even been able to complete the gift of the Torah I had wanted to give to you. A reference to “the Torah and the Mitzvah” in Exodus 24,12.

סרו מהר מן הדרך, "they have quickly departed from the path, etc." The meaning of these words is clear in view of the statement in Chulin 4 that if someone acknowledges even passively that there is some substance to idolatry he is considered as having denied the entire Torah. This is why G'd said: "which I have commanded them," i.e. "all that I have commanded them."