Sunan an-Nasa'i, Book 43, Hadith 75 (In-Book) ⓘ
'Abdullah bin Mughaffal said: "A bag of fat was thrown on the day of Khaibar, and I caught it and said: "I will not give anything of this to anyone.' I turned around and saw the Messenger of Allah there, smiling." (Sahih )
أَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ سُلَيْمَانَ بْنِ مُغِيرَةَ، قَالَ حَدَّثَنَا حُمَيْدُ بْنُ هِلاَلٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُغَفَّلٍ، قَالَ دُلِّيَ جِرَابٌ مِنْ شَحْمٍ يَوْمَ خَيْبَرَ فَالْتَزَمْتُهُ قُلْتُ لاَ أُعْطِي أَحَدًا مِنْهُ شَيْئًا فَالْتَفَتُّ فَإِذَا رَسُولُ اللَّهِ صلى الله عليه وسلم يَتَبَسَّمُ .
also referenced under: Hadith 4435 (Reference) & Volume 5, Book 43, Hadith 4440 (DarusSalam)