Chapter 35: Chapters On Witnesses
' Abdur-Rahman bin Abi Bakrah narrated from his father that the Messenger of Allah (s. a. w) said: "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 2301