Al-Baqarah 2:51

Wa-ith waAAadna moosaarbaAAeena laylatan thumma ittakhathtumu alAAijla minbaAAdihi waantum thalimoon

And [recall] when We made an appointment with Moses for forty nights. Then you took [for worship] the calf after him [i.e., his departure], while you were wrongdoers.

And when We appointed forty nights for Mūsā, then you took the calf (as God) thereafter, and you were unjust.