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. (Using translation from Abū Dāʾūd 3164)
رَأَى نَاسٌ نَارًا فِي الْمَقْبَرَةِ فَأَتَوْهَا فَإِذَا رَسُولُ اللهِ ﷺ فِي الْقَبْرِ وَإِذَا هُوَ يَقُولُ نَاوِلُونِي صَاحِبَكُمْ وَإِذَا هُوَ الرَّجُلُ الْأَوَّاهُ الَّذِي يَرْفَعُ صَوْتَهُ بِالذِّكْرِ