There was some exchange of words between 'Uthman ibn 'Affan and Amir al-mu'minin when al-Mughirah ibn al-Akhnas
said to 'Uthman that he would deal with Amir al-mu'minin on his behalf whereupon Amir al-mu'minin said to al-Mughirah:
ومن كلام له (عليه السلام)
وقد وقعت مشاجرة بينه وبين عثمان، فقال المغيرة بن الاخنس لعثمان: أنا أكِفيكَه، فقال أميرالمؤمنين صلوات الله عليه للمغيرة:
O son of the accursed and issueless, and of a tree which has neither root nor branch. Will you deal with me? By Allah, Allah will not grant victory to him whom you support, nor will he be able to stand up whom you raise. Get away from us. Allah may keep you away from your purpose. Then do whatever you like. Allah may not have mercy on you if you have pity on me.
يَابْنَ اللَّعِينِ الاْبْتَرِ، وَالشَّجَرَةِ الَّتي لاَ أَصْلَ لَهَا وَلاَ فَرْعَ، أَنْتَ تَكْفِينِي، فَوَاللهِ مَاأَعَزَّ اللهُ مَنْ أَنْتَ نَاصِرُهُ، وَلاَ قَامَ مَنْ أَنْتَ مُنْهِضُه، اخْرُجْ عَنَّا أَبْعَدَ اللهُ نَوَاكَ، ثُمَّ ابْلُغْ جَهْدَك، فَلاَ أَبْقَى اللهُ عَلَيْكَ إِنْ أَبْقَيْتَ!
(1) Ibn A'tham al-Kufi, al-Futuh, II, 165.