YOM KIPPUR: FORGIVEN FOR THE SIN OF THE GOLDEN CALF

On the fortieth day, which was the seventeenth of Tammuz, he descended where he found the nation of Israel sinning with the Golden Calf and broke the luchos (tablets containing the Ten Commandments).

Moshe ascended the mountain the second time on the eighteenth of Tammuz to seek compassion from the God of Israel because of the sin of the Golden Calf.