Muwatta Malik #1955
Speech
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."
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About Muwatta Malik
This hadith is #1955 from Muwatta Malik, in the Book of Speech. Muwatta Malik contains 1,985 hadiths across 61 books.