Mishkat al-Masabih #1624
Funerals
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن جَابر قَالَ: رُشَّ قَبْرُ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَكَانَ الَّذِي رَشَّ الْمَاءَ عَلَى قَبْرِهِ بِلَالُ بْنُ رَبَاحٍ بِقِرْبَةٍ بَدَأَ مِنْ قِبَلِ رَأْسِهِ حَتَّى انْتَهَى إِلَى رِجْلَيْهِ. رَوَاهُ الْبَيْهَقِيُّ. فِي دَلَائِل النُّبُوَّة
He said that the Prophet’s grave was sprinkled and that the one who sprinkled the water over his grave from a water-skin was Bilal b. Rabah. He began where the head was and sprinkled it to his feet.
Baihaqi transmitted it in Dalail an-nubuwa.
About Mishkat al-Masabih
This hadith is #1624 from Mishkat al-Masabih, in the Book of Funerals.