Ki Tissa it better to let the people worship the Golden Calf, for which they might yet find forgiveness through repentance. And thus Rabbi Tanhum bar Hanilai concluded that it was in reference to Aaron's decision-making in this incident that can be read to mean, "He who praises one who makes a compromise blasphemes God." The Sages told that Aaron really intended to delay the people until Moses came down, but when Moses saw Aaron beating the Golden Calf into shape with a hammer, Moses thought that Aaron was participating in the sin and was incensed with him. So God told Moses
Shlach Golden Calf, Moses foretold that he would behold God's Glory and make atonement for the Israelites' iniquities on Yom Kippur. On that day, Moses asked God to pardon the iniquities of the people in connection with the Golden Calf. God told Moses that if he had asked God then to pardon the iniquities of all Israel, even to the end of all generations, God would have done so, as it was the appropriate time. But Moses had asked for pardon with reference to the Golden Calf, so God told Moses that it would be according to his words, as says,