وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: «حَفِظْتُ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وِعَاءَيْنِ فَأَمَّا أَحَدُهُمَا فَبَثَثْتُهُ فِيكُمْ وَأَمَّا الْآخَرُ فَلَوْ بَثَثْتُهُ قُطِعَ هَذَا الْبُلْعُومُ يَعْنِي مجْرى الطَّعَام» رَوَاهُ البُخَارِيّ

Abu Huraira said, "I have kept in my memory two large quantities* of learning from God’s messenger, one of which I have disclosed among you; but were I to disclose the other, this bul'um, meaning the food tract, would be cut". Bukhari transmitted it. *Lit. receptacles, or vessels.