Surah Al-Mai'dah (The Spread Table), Verse 101

یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْا لَا تَسْـَٔلُوْا عَنْ اَشْیَآءَ اِنْ تُبْدَ لَكُمْ تَسُؤْكُمْ وَاِنْ تَسْـَٔلُوْا عَنْهَا حِیْنَ یُنَزَّلُ الْقُرْاٰنُ تُبْدَ لَكُمْ عَفَا اللّٰهُ عَنْهَا وَاللّٰهُ غَفُوْرٌ حَلِیْمٌ ۟

yaaa aiyuhal lazeena aamanoo laa tas'aloo 'an ashyaaa'a in tubda lakum tasu'kum wa in tas'aloo 'anhaa heena yunazzalul Qur'aanu tubda lakum; 'afallaahu 'anhaa; wallaahu Ghafoorun Haleem

“O ye who believe! Ask not questions about things which, if made plain to you, may cause you trouble. But if ye ask about things when the Qur'an is being revealed, they will be made plain to you, Allah will forgive those: for Allah is Oft-forgiving, Most Forbearing.”

Quran 5:101 (Yusuf Ali Translation)