ENOfficial
Ja'far b. Muhammad told on his father's authority that when God's messenger ate along with people he was the last to finish eating. Baihaqi transmitted it in Shu'ab al-iman in mursal form.
Source: sunnah.com
Other translations
Arabic
وَعَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا أَكَلَ مَعَ قَوْمٍ كَانَ آخِرَهُمْ أَكْلًا. رَوَاهُ الْبَيْهَقِيّ فِي «شعب الْإِيمَان» مُرْسلا
sunnah.com