Surah Saba' (The Sheba), Verse 46

قُلْ اِنَّمَاۤ اَعِظُكُمْ بِوَاحِدَةٍ اَنْ تَقُوْمُوْا لِلّٰهِ مَثْنٰی وَفُرَادٰی ثُمَّ تَتَفَكَّرُوْا مَا بِصَاحِبِكُمْ مِّنْ جِنَّةٍ اِنْ هُوَ اِلَّا نَذِیْرٌ لَّكُمْ بَیْنَ یَدَیْ عَذَابٍ شَدِیْدٍ ۟

Qul innamaaa a'izukum biwaahidatin an taqoomoo lillaahi masnaa wa furaadaa summa tatafakkaroo; maa bisaahibikum min jinnah; in huwa illaa nazeerul lakum baina yadai 'azaabin shadeed

“Say: "I do admonish you on one point: that ye do stand up before Allah,- (It may be) in pairs, or (it may be) singly,- and reflect (within yourselves): your Companion is not possessed: he is no less than a warner to you, in face of a terrible Penalty."”

Quran 34:46 (Yusuf Ali Translation)