وَإِذۡ وَٰعَدۡنَا مُوسَىٰٓ أَرۡبَعِينَ لَيۡلَةٗ ثُمَّ ٱتَّخَذۡتُمُ ٱلۡعِجۡلَ مِنۢ بَعۡدِهِۦ وَأَنتُمۡ ظَٰلِمُونَ ٥١
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.
Translation: Saheeh International (English)
Each word's meaning and sound
Also, remember that the forty nights appointed to Moses were from the blessings of Allah, in which the revelation of the Torah, with its light and guidance, was completed. Yet you went and worshipped the calf during that period, which made you into wrongdoers.
Al-Mukhtasar in interpreting the Noble Quran