Quran 48:23 from Surah Al-Fath on Divine Marvels.
سُنَّةَ ٱللَّهِ ٱلَّتِي قَدۡ خَلَتۡ مِن قَبۡلُۖ وَلَن تَجِدَ لِسُنَّةِ ٱللَّهِ تَبۡدِيلٗا
English translation: (The established) way (of) Allah which passed away passed away before before and never you will find in (the) way of Allah in (the) way of Allah any change
Transliteration: sunnata al-lahi allati qad khalat min qablu walan tajida lisunnati al-lahi tabdilan