Quran 17:28 from Surah Al-Israa on Divine Marvels.
وَإِمَّا تُعۡرِضَنَّ عَنۡهُمُ ٱبۡتِغَآءَ رَحۡمَةٖ مِّن رَّبِّكَ تَرۡجُوهَا فَقُل لَّهُمۡ قَوۡلٗا مَّيۡسُورٗا
English translation: And if you turn away from them seeking mercy from your Lord which you expect then say to them a word gentle
Transliteration: wa-imma tu'ridanna anhumu ib'tighaa rahmatin min rabbika tarjuha faqul lahum qawlan maysuran