"O you people! False witness is tantamount to Shirk with Allah."Saying it three times, then he recited this Ayah And shun false speech Until the end of the Ayah.
Jami` at-Tirmidhi Book 35, Hadith 6
← Previous Hadith "O you people False witness is tantamount to Shirk with Allah" Then the Messenger of Allah (s.a.w)recited: So shun the Rijs of the idols, and shun false speech.

Jami` at-Tirmidhi Book 35, Hadith 5 Next Hadith → "Shall I not inform you of the greatest of the major sins?" They said: "Of course O Messenger of Allah(s.a.w)!" He said: "Shirk with Allah disobeying parents, and false testimony." Or: "False speech" He said: "So the Messenger of Allah(s.a.w) would not stop saying it until we said ( to ourselves): 'I wish he would be quiet. "

Jami` at-Tirmidhi Book 35, Hadith 7