Its chain of transmission is sound. It is narrated by Mūsā ibn ʿUlayy ibn Rabāḥ, from his father, from ʿUqbah ibn ʿĀmir al-Juhanī.
Hafsah and ʿĀ’ishah were the two who sided together against the Prophet ﷺ, so Allah revealed about them: “If you two repent to Allah, your hearts have certainly swerved; but if you support one another against him, then Allah is his Protector, and Gabriel …” (1) [al-Taḥrīm 66:4].
Mūsā ibn ʿUlayy ibn Rabāḥ—through his father, from ʿUqbah—said:
“The Messenger of Allah ﷺ divorced Hafsah. When the news reached ʿUmar, he threw dust over his head and cried, ‘Allah no longer cares about ʿUmar and his daughter.’ The next day Gabriel descended and said to the Prophet ﷺ, ‘Allah commands you to take Hafsah back, as a mercy to ʿUmar.’” (2)
Hafsah died in 41 AH, the Year of Unity. Others say she died in 45 AH in Medina, and that Marwān, the governor of Medina, led her funeral prayer. This was reported by al-Wāqidī, from Maʿmar, from al-Zuhrī, from Sālim. (3)
= Al-Juniy, on the authority of Qays b. Zayd, relates that the Prophet divorced Hafsa, the daughter of Umar. Her two maternal uncles, Qudama and Uthman, the sons of Mazun, entered upon her; she wept and said, “By Allah, he did not divorce me out of distaste.” The Prophet then came and said, “Gabriel told me: ‘Take Hafsa back, for she frequently fasts and stands in prayer; she will be your wife in Paradise.’” All the transmitters are reliable except Qays b. Zayd, a little-known junior successor. There is also a textual inaccuracy that will be discussed on p. 231. In the same regard a report from Anas is found in al-Hakim, 4/15; its chain contains al-Hasan b. Abi Jaʿfar, who is weak, while the rest of its narrators are trustworthy. Al-Haythami notes that al-Tabarani transmitted it in al-Awsat with several unknown narrators. A version from Ammar b. Yasir appears in al-Bazzzar and al-Tabarani, as cited in Majmaʿ, 9/244.
(1) Reported by al-Bukhari, 8/504, Tafsir, chapter “You seek to please your wives”, and by Muslim, no. 1474, Divorce, chapter on the obligation of expiation for one who declares his wife unlawful.
(2) Reported by al-Tabarani in al-Kabir; see above.
(3) Ibn Saʿd, 8/86.