'Abd ar-Rahman ibn Abi Bakra reported that his father Abu Bakra said: “Allah’s Messenger said (Allah bless him and give him peace): ‘Should I tell you about the greatest of the major sins?’ They said: ‘Yes indeed, O Messenger of Allah!’ He said: ‘Associating partners with Allah, and recalcitrance against parents.’ Allah’s Messenger (Allah bless him and give him peace) sat down, and he was leaning on a support. He added: '...and false testimony’ or: ‘false speech.’ Allah’s Messenger (Allah bless him and give him peace) went on speaking until we said: ‘If only he would keep silent!”