Surah Yusuf (Joseph), Verse 110

حَتّٰۤی اِذَا اسْتَیْـَٔسَ الرُّسُلُ وَظَنُّوْۤا اَنَّهُمْ قَدْ كُذِبُوْا جَآءَهُمْ نَصْرُنَا فَنُجِّیَ مَنْ نَّشَآءُ وَلَا یُرَدُّ بَاْسُنَا عَنِ الْقَوْمِ الْمُجْرِمِیْنَ ۟

Hattaaa izas tai'asar Rusulu wa zannooo annahum qad kuziboo jaaa'ahum nas runaa fanujjiya man nashaaa'u wa laa yuraddu baasunna 'anil qawmil mujrimeen

“(Respite will be granted) until, when the messengers give up hope (of their people) and (come to) think that they were treated as liars, there reaches them Our help, and those whom We will are delivered into safety. But never will be warded off our punishment from those who are in sin.”

Quran 12:110 (Yusuf Ali Translation)