Hadith 8:161
Jabir said the Prophet owed him a debt and gave him something extra when he paid it. Abu Dawud transmitted it.
وَعَنْ جَابِرٍ قَالَ: كَانَ لِي عَلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ دَيْنٌ فَقَضَانِي وَزَادَنِي. رَوَاهُ أَبُو دَاوُد
Original Reference: Mishkat al-Masabih 2925