Hadith 518120
Chapter 56: Speech - كتاب الكلام
وَحَدَّثَنِي مَالِكٌ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، أَنَّهُ قَالَ قِيلَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم أَيَكُونُ الْمُؤْمِنُ جَبَانًا فَقَالَ " نَعَمْ " . فَقِيلَ لَهُ أَيَكُونُ الْمُؤْمِنُ بَخِيلاً فَقَالَ " نَعَمْ " . فَقِيلَ لَهُ أَيَكُونُ الْمُؤْمِنُ كَذَّابًا فَقَالَ " لاَ " .
Malik related to me that Safwan ibn Sulaym said, "The Messenger of Allah, may Allah bless him and grant him peace, was asked, 'Can the mumin be a coward?' He said, 'Yes.' He was asked, 'Can the mumin be a miser?' He said, 'Yes.' He was asked, 'Can the mumin be a liar?' He said, 'No.' "
Reference Muwatta Malik 518120
USC-MSA web (English) reference : Book 56, Hadith 19