Sunan At-Tirmidhi

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