Al-Adab Al-Mufrad #388

'Abdullah reported that the Prophet, may Allah bless him and grant him peace, said, "You must be truthful. Truthfulness leads to dutifulness and dutifulness leads to the Garden. A man continues to tell the truth until he is written as a siddiq with Allah. Beware of lying. Lying leads to deviance and deviance leads to the Fire. A man continues to lie until he is written as a liar with Allah."