Abu Ukkashah narrates that Rifa'ah al-Bajali went to al-Mukhtar bin Abi Ubayd, and al-Mukhtar said to him: "Jibril has just left me." Rifa'ah said: I remembered a hadith which Sayyiduna Rifa'ah bin Surad (may Allah be pleased with him) had narrated to me, that the Prophet (peace and blessings be upon him) said: "Whoever grants another man safety for his life must not kill him." Rifa'ah said: I had already granted al-Mukhtar safety for his life; had it not been for that, I would have cut off his head.
Al-Tabarani recorded it, and he judged that Abdullah bin Maysarah erred in it.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الديات / 10714