Hadith 24:70
Ibn Idris narrated to us, from Mis'ar, from 'Amr ibn Murrah, from 'Abd al-Rahman ibn Abi Layla, who said: A man came to Ka'b ibn 'Ujrah and began mentioning 'Abd Allah ibn Ubayy and what was revealed in the Qur'an regarding him, and he was insulting him. There was a bond of sanctity and kinship between him [Ka'b] and him [Ibn Ubayy], and Ka'b was silent. The man then went to 'Umar and said, "O Commander of the Faithful, did you not see that I mentioned what was revealed regarding 'Abd Allah ibn Ubayy, yet there was no reaction from Ka'b?" 'Umar met Ka'b and said, "Was I not informed that 'Abd Allah ibn Ubayy was mentioned in your presence, yet there was no reaction from you?" Ka'b said, "I heard his speech, but when I saw that he was seemingly intending to offend me [I remained silent]." 'Umar said, "I wish I had struck his nose," or he said, "I wish I had broken his nose."
حدثنا بن إدريس عن مسعر عن عمرو بن مرة عن عبد الرحمن بن أبي ليلى قال جاء رجل إلى كعب بن عجرة فجعل يذكر عبد الله بن أبي وما نزل فيه من القرآن ويسبه وكان بينه وبينه حرمة وقرابة وكعب ساكت قال فانطلق الرجل إلى عمر فقال يا أمير المؤمنين ألم تر أني ذكرت ما نزل في عبد الله بن أبي فلم يكن من كعب فالتقى عمر كعبا فقال الم أخبر أن عبد الله بن أبي ذكر عندك فلم يكن منك قال كعب قد سمعت مقالته فلما رأيته كأنه يعمد مساءتي قال فقال عمر وددت لو ضربت أنفه أو وددت أني لو كسرت أنفه