Surat Saba' - سورة سبأ

قُلْ إِنَّمَا أَعِظُكُم بِوَاحِدَةٍ ۖ أَن تَقُومُوا لِلَّهِ مَثْنَىٰ وَفُرَادَىٰ ثُمَّ تَتَفَكَّرُوا ۚ مَا بِصَاحِبِكُم مِّن جِنَّةٍ ۚ إِنْ هُوَ إِلَّا نَذِيرٌ لَّكُم بَيْنَ يَدَيْ عَذَابٍ شَدِيدٍ

Muhsin Khan: Say (to them O Muhammad SAW): "I exhort you on one (thing) only: that you stand up for Allah's sake in pairs and singly, and reflect (within yourselves the life history of the Prophet SAW): there is no madness in your companion (Muhammad SAW), he is only a warner to you in face of a severe torment."