Quran 6:88 from Surah Al-An'aam on Divine Marvels.
ذَٰلِكَ هُدَى ٱللَّهِ يَهۡدِي بِهِۦ مَن يَشَآءُ مِنۡ عِبَادِهِۦۚ وَلَوۡ أَشۡرَكُواْ لَحَبِطَ عَنۡهُم مَّا كَانُواْ يَعۡمَلُونَ
English translation: That (is the) Guidance (of) Allah He guides with it whom He wills of His slaves But if they (had) associated partners (with Allah) surely (would be) worthless for them what they used to do
Transliteration: dhalika huda al-lahi yahdi bihi man yashau min ibadihi walaw ashraku lahabita anhum ma kanu ya'maluna