Sunan Ibn Majah, Volume 5, Book 37, Hadith 4147 (DarusSalam) ⓘ
It was narrated that Anas bin Malik said: “I heard the Messenger of Allah say several times: ‘By the One in Whose Hand is the soul of Muhammad, the family of Muhammad does not have a Sa’ of food grains or a Sa’ of dates.’ And at that time he had nine wives.”
حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا الْحَسَنُ بْنُ مُوسَى، أَنْبَأَنَا شَيْبَانُ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ مِرَارًا " وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ مَا أَصْبَحَ عِنْدَ آلِ مُحَمَّدٍ صَاعُ حَبٍّ وَلاَ صَاعُ تَمْرٍ " . وَإِنَّ لَهُ يَوْمَئِذٍ تِسْعَ نِسْوَةٍ .
also referenced under: Hadith 4147 (Reference) & Book 37, Hadith 4286 (In-Book)