||The next day, Moses said to the people, 'You have committed a terrible sin. Now I will go back up to God and try to gain atonement for your crime.'
Vayehi mimochorat vayomer Moshe el-ha'am atem chatatem chata'ah gedolah ve'atah e'eleh el-Adonay ulay achaprah be'ad chatatchem.
||Moses went back up to God, and he said, 'The people have committed a terrible sin by making a golden idol.
Vayashav Moshe el-Adonay vayomar ana chata ha'am hazeh chata'ah gedolah vaya'asu lahem elohey zahav.
|went back up...|
This was on 18 Tammuz (Seder Olam 6) or 19 Tammuz (Rashi on Exodus 33:11). Moses then remained on the mountain for an additional 40 days (cf. Deuteronomy 9:25). According to some, however, Moses ascended for only a short while, and then prayed for 40 days in the camp (Pirkey Rabbi Eliezer 46; Radal ad loc. 46:13; Ramban on Exodus 33:11).