Quran 15:55 from Surah Al-Hijr on Divine Marvels.
قَالُواْ بَشَّرۡنَٰكَ بِٱلۡحَقِّ فَلَا تَكُن مِّنَ ٱلۡقَٰنِطِينَ
English translation: They said We give you glad tidings in truth so (do) not be of the despairing
Transliteration: qalu basharnaka bil-haqi fala takun mina al-qanitina