Ibn Shihab (may Allah have mercy on him) said: Sayyiduna Uthman and Sayyiduna Mu'awiyah (may Allah be pleased with them both) did not kill a believer in return for a polytheist.
The first (narration) is connected (mawsul), and this one is munqati' (has a broken chain).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15932