Malik related to me that he heard that Abdullah ibn Masud used to
say, "You must tell the truth. Truthfulness leads to right action.
Right action leads to the Garden. Beware of lying. Lying leads to
corruption, and corruption leads to the Fire. Don't you see that it is
said, 'He speaks the truth and acts rightly,' and, 'He lies and is
corrupt.' "
Muwatta Malik Book 56, Hadith 16