Muwatta Malik #1955
Speech
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ، كَانَ يَقُولُ لاَ يَزَالُ الْعَبْدُ يَكْذِبُ وَتُنْكَتُ فِي قَلْبِهِ نُكْتَةٌ سَوْدَاءُ حَتَّى يَسْوَدَّ قَلْبُهُ كُلُّهُ فَيُكْتَبَ عِنْدَ اللَّهِ مِنَ الْكَاذِبِينَ .
Malik related to me that he heard that Abdullah ibn Masud used to
say, "The slave continues to lie and a black spot grows in his heart
until all his heart becomes black. Then he is written, in Allah's
sight, among the liars."
Topics
About Muwatta Malik
This hadith is #1955 from Muwatta Malik, in the Book of Speech.