Abu Talha ordered Umm Sulaim to prepare a meal specially for Allah's Apostle ﷺ. He then sent me to him (to the Holy Prophet) ; the rest of the hadith is the same (but there is a slight variation of wording):" Messenger of Allah ﷺ placed his hand and mentioned the name of Allah upon that, and then said: Admit ten men. He (Abu Talha) admitted them and they got in. He (the Holy Prophet) said: Eat while mentioning the name of Allah upon it (the meal). They ate until eighty persons had taken the food. Then Allah's Apostle ﷺ had his meal and so the members of the household, and still they left some food."  

أَنْ تَصْنَعَ لِلنَّبِيِّ ﷺ طَعَامًا لِنَفْسِهِ خَاصَّةً ثُمَّ أَرْسَلَنِي إِلَيْهِ وَسَاقَ الْحَدِيثَ وَقَالَ فِيهِ فَوَضَعَ النَّبِيُّ ﷺ يَدَهُ وَسَمَّى عَلَيْهِ ثُمَّ قَالَ ائْذَنْ لِعَشَرَةٍ فَأَذِنَ لَهُمْ فَدَخَلُوا فَقَالَ كُلُوا وَسَمُّوا اللَّهَ فَأَكَلُوا حَتَّى فَعَلَ ذَلِكَ بِثَمَانِينَ رَجُلاً ثُمَّ أَكَلَ النَّبِيُّ ﷺ بَعْدَ ذَلِكَ وَأَهْلُ الْبَيْتِ وَتَرَكُوا سُؤْرًا