He said that Mu’adh would pray the evening prayer along with the Prophet, then return to his people and lead them in the evening prayer, it being a supererogatory prayer for him…* transmitted it. * The source is not mentioned. In al-Masabih, where the division of the chapters is into traditions which are sahih and traditions which are hasan, the collection of Tradition from which they are taken is not mentioned, but all those in section I are meant to be taken from Bukhari, or Muslim, or both. I have failed to find this one anywhere. The concordance does not seem to refer to it.

Allāhumma lā tu'ākhidhnī bimā yaqūlūn, waghfir lī mā lā ya`lamūn [waj`alnī khayran mimmā yaẓunnūn]. O Allah, do not call me to account for what they say and forgive me for what they have no knowledge of [and make me better than they imagine]. Reference: Al-Bukhari, Al-'Adabul-Mufrad no. 761. See Al-Albani, Sahih Al-'Adabul-Mufrad (no. 585). The portion between brackets if from Al-Bayhaqi, Shu'ab Al-Iman 4/228, and comes another account.

Abu Shuraih al-Ka'bi reported God’s Messenger as saying, “Then you, Khuza’a, have killed this man of Hudhail, but I swear by God that I will pay his blood wit. If anyone kills a man hereafter his people will have a choice, to kill him if they wish, or to accept blood wit if they wish." Tirmidhi and Shafi‘i transmitted it. It occurs in Sharh as-sunna with his isnad, but it states clearly that it does not occur in the two Sahihs on the authority of Abu Shuraih, saying that they rendered it from Abu Huraira’s version, meaning something similar.* *In Masabih as-sunna the tradition is given among the sound ones without any reference to its source. Here Sharh as-sunna is quoted to the effect that the above tradition is not given by Bukhari or Muslim, but that they give something similar on Abu Huraira’s authority. Section 1 is normally confined to traditions from Bukhari or Muslim, or from both, so it is strange to find that a tradition from another source is here preferred to theirs.