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 مَقْبَرَةٍ فَأَتَوْهَا فَإِذَا رَسُولُ اللهِ ﷺ يَقُولُ «نَاوِلُونِي صَاحِبَكُمْ» وَإِذَا هُوَ الرَّجُلُ الَّذِي كَانَ يَرْفَعُ صَوْتَهُ بِالذِّكْرِ