Sahih Bukhari Book: 97, Hadith: 7442

حَدَّثَنَا حَمَّادُ بْنُ حُمَيْدٍ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، عَنْ سَعْدِ بْنِ إِبْرَاهِيمَ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، قَالَ رَأَيْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ يَحْلِفُ بِاللَّهِ أَنَّ ابْنَ الصَّائِدِ الدَّجَّالُ، قُلْتُ تَحْلِفُ بِاللَّهِ‏.‏ قَالَ إِنِّي سَمِعْتُ عُمَرَ يَحْلِفُ عَلَى ذَلِكَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَلَمْ يُنْكِرْهُ النَّبِيُّ صلى الله عليه وسلم‏.‏ Narrated Muhammad bin Al-Munkadir: I saw Jabir bin `Abdullah swearing by Allah that Ibn Sayyad was the Dajjal. I said to Jabir, “How can you swear by Allah?” Jabir said, “I have heard `Umar swearing by Allah regarding this matter in the presence of the Prophet and the Prophet did not disapprove of it.” Chain : Hmad bin Hameed al-Khrasany – ‘Ubaidullah bin Mua’dh – Mua’dh bin Mua’dh bin Nsr – Shu’bah bin al-Hajjaj – Sa’d bin Ibrahim – Muhammad bin al-Munkdar b...