Aisha said: "Do you not know that the Messenger of Allah ﷺ said: 'The blood of a Muslim man is not lawful [to shed] except for three: a man who commits adultery after having been married, or one who disbelieves after his Islam, or a life for a life.'" (1)

Zuhayr reported it as a saying of Aisha (mawquf):

4018 - Hilal ibn al-'Ala' informed us, saying: Husayn narrated to us, saying: Zuhayr narrated to us, saying: Abu Ishaq narrated to us, from 'Amr ibn Ghalib, who said:
Aisha said: "O 'Ammar, do you not know that the blood of a man is not lawful [to shed] except for three: a life for a life, or a man who committed adultery after having been married..." and he continued the hadith. (5)

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(1) A sound hadith, and this chain contains 'Amr ibn Ghalib, from whom only Abu Ishaq — that is, 'Amr ibn 'Abdullah al-Sabi'i — narrated. Al-Hafiz Ibn Hajar in his "Tahdhib" quoted Abu 'Amr al-Sadafi that al-Nasa'i declared him trustworthy, and al-Tirmidhi authenticated a hadith narrated by him concerning the virtue of Aisha. He has been followed — as in the previous narration — in the text of the hadith, and the rest of the narrators in the chain are trustworthy. Yahya: he is Ibn Sa'id al-Qattan. It is in "Al-Sunan al-Kubra" under number (3466).

There is disagreement regarding Abu Ishaq al-Sabi'i as to whether he raised it to the Prophet (marfu') or stopped it at Aisha (mawquf):
Sufyan al-Thawri narrated it as marfu' as here and in "Musnad Ahmad" (25477), (25700), and (25794); Yunus ibn Abi Ishaq as in "Musnad Ahmad" (24304); Isra'il ibn Yunus ibn Abi Ishaq as in "Musnad Ahmad" (25700); and Abu al-Ahwas Sallam ibn Sulaym as in the takhrij of narration (24304) of "Musnad Ahmad" — all four narrated it from Abu Ishaq with this chain as marfu'.
And Zuhayr ibn Mu'awiya narrated it as in the following narration, from Abu Ishaq, as mawquf.
Al-Daraqutni in "Al-'Ilal" 14/385 deemed correct the narration of Sufyan al-Thawri and those who followed him.
It has preceded in the one before this with two sound chains.
Al-Sindi said: His statement: "except a man" — in the nominative case as a substitute, with the implied meaning: except the blood of a man.

(2) In (M) and (R) it was corrupted to: "and he agreed with him."
(3) After it in (M) there is an addition: "Muslim."
(4) In (R): "after his having been married."
(5) Sound as marfu', and this chain has been discussed in the previous narration, and in it he differed =