Quran 7:150 — The Purgatory (Al-A'araf)

When Moses returned to his people, angry and disappointed, he said, "What a terrible thing you have done in my absence! Could you not wait for the commandments of your Lord?" He threw down the tablets, and took hold of his brother's head, pulling him towards himself. (Aaron) said, "Son of my mother, the people took advantage of my weakness, and almost killed me. Let not my enemies rejoice, and do not count me with the transgressing people."

[7:149] Finally, when they regretted their action, and realized that they had gone astray, they said, "Unless our Lord redeems us with His mercy, and forgives us, we will be losers."

[7:151] (Moses) said, "My Lord, forgive me and my brother, and admit us into Your mercy. Of all the merciful ones, You are the Most Merciful."