Talha's role in the killing of Uthman
Siyar ALAM nubala v1 p36
Jawairiya bin Asma narrated from Yahya bin Saeed who narrated from his uncle that Marwan shot Talha an arrow and killed him, then he looked at Aban (son of Uthman) and said: ‘I have spared you from one of the murderers of your father.’
جويرية بن أسماء عن يحيى بن سعيد عن عمه أن مروان رمى طلحة بسهم فقتله ، ثم التفت إلى أبان فقال قد كفيناك بعض قتلة أبيك
Ibn ʿAsakir in Tarikh Dimashq, V39 p403
Qays ibn Abi Hazim reports from a man who entered upon Talha while Uthman was under siege. The man asked Talha whether he would go out and restrain the people from killing Uthman. Talha refused, saying that he would not do so until the Banu Umayya gave up what was due from themselves.
عن قيس بن أبي حازم قال: أخبرني من دخل على طلحة بن عبيد الله وعثمان محصور وهو مستلق على سريره، فقال: ألا تخرج فتنهي عن قتل هذا الرجل؟ قال: لا والله حتى تؤتي بنو أمية الحق من أنفسها.
Ibn Abi Shaybah in al-Musannaf, V8 p685
Hakim ibn Jabir reports that when Uthman was under siege, Ali went to Talha, who was reclining on cushions in his house. Ali appealed to him by Allah to turn the people away from the Commander of the Believers, warning that Uthman was going to be killed. Talha refused, saying: “No, by Allah, not until the Banu Umayya give what is rightfully due from themselves.”
يعلى بن عبيد، عن إسماعيل بن أبي خالد، عن حكيم بن جابر قال: لما حصر عثمان أتى علي طلحة وهو مستند إلى وسائد في بيته فقال: أنشدك الله! ما رددت الناس عن أمير المؤمنين فإنه مقتول، فقال طلحة: لا والله حتى تعطي بنو أمية الحق من أنفسها.