The Messenger of Allah ﷺ said, "Shall I tell you about the gravest of major sins?"They replied, "Yes, Messenger of Allah."He said, "Associating partners with Allah, and disobedience to parents."He had been reclining, but then he sat up and said, "And bearing false witness," or he said, "and false speech."The Messenger of Allah ﷺ kept repeating it until we wished he would stop.
حدثنا حميد بن مسعدة بصري حدثنا بشر بن المفضل حدثنا الجريري
قال رسول الله ﷺ ألا أحدثكم بأكبر الكبائر قالوا بلى يا رسول الله قال الإشراك بالله وعقوق الوالدين قال وجلس وكان متكئا قال وشهادة الزور أو قال قول الزور قال فما زال رسول الله ﷺ يقولها حتى قلنا ليته سكت
Agreed upon [by Bukhari and Muslim]. Bukhari narrated it in the Book of Testimonies, chapter on what was said regarding false testimony, hadith no. 2654, from the hadith of Bishr bin Mufaddal, and Muslim narrated it, hadith no. 87, from the hadith of Jareeri, through him.