Abdullah reported Allah’s Messenger (may peace be upon him) as saying: Truth leads one to Paradise and virtue leads one to Paradise and the person tells the truth until he is recorded as truthful, and lie leads to obscenity and obscenity leads to Hell, and the person tells a lie until he is recorded as a liar.
Sahih Muslim – Book 32 Hadith 6307
Narrated Sahl bin Sa`d: The Prophet said, “Whoever guarantees me (the chastity of) what is between his legs (i.e. his private parts), and what is between his jaws (i.e., his tongue), I guarantee him Paradise.”
Sahih Al-Bukhari – Book 82 Hadith 799
Narrated Sufyan ibn Asid al-Hadrami: I heard the Apostle of Allah (peace be upon him) say: It is great treachery that you should tell your brother something and have him believe you when you are lying.
Sunan of Abu-Dawood – Book 41 Hadith 4953
The Prophet said, “Truthfulness leads to righteousness, and righteousness leads to Paradise. And a man keeps on telling the truth until he becomes a truthful person. Falsehood leads to Al-Fajur (i.e. wickedness, evil-doing), and Al-Fajur (wickedness) leads to the (Hell) Fire, and a man may keep on telling lies till he is written before Allah, a liar.”
Sahih Al-Bukhari – Book 73 Hadith 116
Allah’s Apostle said, “The signs of a hypocrite are three: Whenever he speaks, he tells a lie; and whenever he promises, he breaks his promise; and whenever he is entrusted, he betrays (proves to be dishonest)”.
Sahih Al-Bukhari – Book 73 Hadith 117
The Prophet said, “Whoever does not give up forged speech and evil actions, Allah is not in need of his leaving his food and drink (i.e. Allah will not accept his fasting.)”
Sahih Al-Bukhari – Book 31 Hadith 127
It is narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) observed: Three (are the persons) with whom Allah would neither speak, nor would He absolve them on the Day of Resurrection. Abu Mu’awiya added: He would not look at them and there is grievous torment for them: the aged adulterer, the liar king and the proud destitute.
Sahih Muslim – Book 1 Hadith 195
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Abdullah b. Mas’ud reported that Muhammad (may peace be upon him) said: Should I inform you that slandering, that is in fact a tale-carrying which creates dissension amongst people, (and) he (further) said: The person tells the truth until he is recorded as truthful, and lie tells a lie until lie is recorded as a liar.
Sahih Muslim – Book 32 Hadith 6306