The people saw fire (light) in the graveyard and they went there. They found that the Messenger of Allah ﷺ was in a grave and he was saying: Give me your companion. This was a man who used to raise his voice while mentioning the name of Allah.  

رَأَى نَاسٌ نَارًا فِي الْمَقْبَرَةِ فَأَتَوْهَا فَإِذَا رَسُولُ اللَّهِ ﷺ فِي الْقَبْرِ وَإِذَا هُوَ يَقُولُ نَاوِلُونِي صَاحِبَكُمْ فَإِذَا هُوَ الرَّجُلُ الَّذِي كَانَ يَرْفَعُ صَوْتَهُ بِالذِّكْرِ