Muwatta Imam Malik Book of Speech, Hadith 19

Malik related to me that Safwan ibn Sulaym said, "The Messenger of Allah ﷺ 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.' "

وَحَدَّثَنِي مَالِكٌ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، أَنَّهُ قَالَ قِيلَ لِرَسُولِ اللَّهِ ﷺ أَيَكُونُ الْمُؤْمِنُ جَبَانًا فَقَالَ " نَعَمْ " . فَقِيلَ لَهُ أَيَكُونُ الْمُؤْمِنُ بَخِيلاً فَقَالَ " نَعَمْ " . فَقِيلَ لَهُ أَيَكُونُ الْمُؤْمِنُ كَذَّابًا فَقَالَ " لاَ " .