Surah Al-Baqarah (The Cow), Verse 51

وَاِذْ وٰعَدْنَا مُوْسٰۤی اَرْبَعِیْنَ لَیْلَةً ثُمَّ اتَّخَذْتُمُ الْعِجْلَ مِنْ بَعْدِهٖ وَاَنْتُمْ ظٰلِمُوْنَ ۟

Wa iz waa'adnaa Moosaaa arba'eena lailatan summattakhaztumul 'ijla mim ba'dihee wa antum zaalimoon

“And remember We appointed forty nights for Moses, and in his absence ye took the calf (for worship), and ye did grievous wrong.”

Quran 2:51 (Yusuf Ali Translation)