The Cow - 2:51
We had contracted with Moses for forty nights. But you wronged yourselves after him and served the calf.
Related:
The Heights/7:142
"We made a covenant with Moses for thirty nights and added to it ten nights, so the time appointed by your Lord was completed to forty nights. Moses said to his brother Aaron, "Take my place among my people and act righteously. And do not follow the way of those who do corruption."
The Heights/7:143
"When Moses came to us at the appointed time and his Lord spoke to him, he said, "My Lord, appear to me and let me look at you. "You cannot see me. But look at this mountain; if it stands still, then you will see me."When his Lord appeared to the mountain, He shattered it, and Moses fell unconscious. When he came to his senses, he said, "You are great, to You I turn, and I am the foremost of the believers."
The Heights/7:144
"He said: "Moses, I have chosen you over the people by My messages and by My speaking to you, so take what I have given you and be of the thankful."