Quran 17:23 from Surah Al-Israa on Divine Marvels.
۞وَقَضَىٰ رَبُّكَ أَلَّا تَعۡبُدُوٓاْ إِلَّآ إِيَّاهُ وَبِٱلۡوَٰلِدَيۡنِ إِحۡسَٰنًاۚ إِمَّا يَبۡلُغَنَّ عِندَكَ ٱلۡكِبَرَ أَحَدُهُمَآ أَوۡ كِلَاهُمَا فَلَا تَقُل لَّهُمَآ أُفّٖ وَلَا تَنۡهَرۡهُمَا وَقُل لَّهُمَا قَوۡلٗا كَرِيمٗا
English translation: And has decreed your Lord that (do) not worship except Him Alone and to the parents (be) good Whether reach with you the old age one of them or both of them then (do) not say to both of them a word of disrespect and (do) not repel them but speak to them a word noble
Transliteration: waqada rabbuka alla ta'budu illa iyyahu wabil-walidayni ih'sanan imma yablughanna indaka al-kibara ahaduhuma aw kilahuma fala taqul lahuma uffin wala tanharhuma waqul lahuma qawlan kariman