Ta-Ha - 20:90
"And Aaron said: "My people, you are being tested by him. Your Lord is the Most Merciful. Follow me and obey my command."He had warned them beforehand."
Why did the people of Moses serve the calf?
The Cow/2:93
"Remember when We raised Mount Tur over you and took a promise from you: "Hold fast to what I command you and listen."But they said: "We listened and disobeyed". Because of their disbelief, their hearts were deceived by the calf. Say: "If you have believed, how badly your faith is guiding you!"
The Table Spread/5:71
They thought that they would not be tested, and they became blind and deaf. Then Allah accepted their inclination, but most of them again became blind and deaf. Allah sees what they do.