Quran 5:101 from Surah Al-Maaida on Divine Marvels.
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَسۡـَٔلُواْ عَنۡ أَشۡيَآءَ إِن تُبۡدَ لَكُمۡ تَسُؤۡكُمۡ وَإِن تَسۡـَٔلُواْ عَنۡهَا حِينَ يُنَزَّلُ ٱلۡقُرۡءَانُ تُبۡدَ لَكُمۡ عَفَا ٱللَّهُ عَنۡهَاۗ وَٱللَّهُ غَفُورٌ حَلِيمٞ
English translation: O you who believe (Do) not ask about things if made clear to you it may distress you and if you ask about it when is being revealed the Quran it would be made clear to you has (been) pardoned (by) Allah [about] it and Allah (is) Oft-Forgiving All-Forbearing
Transliteration: yaayyuha alladhina amanu la tasalu an ashyaa in tub'da lakum tasu'kum wa-in tasalu anha hina yunazzalu al-qur'anu tub'da lakum afa al-lahu anha wal-lahu ghafurun halimun