Abdullah bin Sawwar al-Anbari (may Allah have mercy on him) said: A man came to my father, and he rejected his testimony. Then he came again and said: You rejected my testimony? He said: Yes. He said: Why? He said: I have learned that you bear enmity toward the Companions (may Allah be pleased with them). He said: Only toward Amr bin al-As (may Allah be pleased with him). He said: I will also keep you in prison until you repent.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20909