so he uncovered his face, wept, and kissed him between the eyes.

This is a singular hadith.

Al-Bukhari said: “Muhammad ibn ʿAbd Allah ibn ʿUbayd is not especially strong.” (1)

Using the same chain: ʿAbd Allah narrated to us; Muhammad ibn ʿAbd al-Wahhab al-Harithi narrated to us; Muhammad ibn ʿAbd Allah ibn ʿUbayd ibn ʿUmayr … who reported something similar but added: “He wept for a long time, and when ʿUthman was lifted onto the bier he said, ‘Glad tidings to you, O ʿUthman! The world never tainted you, nor you it.’”

Likewise, through this chain: ʿAbd Allah al-Baghawi narrated to us; Dawud ibn ʿAmr al-Musayyabi—in the year 227 AH—narrated to us; Yaʿqub ibn Muhammad ibn Taḥlaʾ related to us, from Abu al-Rijal, from ʿAmra, from ʿAʾisha, who said that the Messenger of Allah ﷺ said, “A household that has no dates—its people are hungry.” (2)

Again, through this chain: ʿAbd Allah narrated to us; Dawud ibn ʿAmr narrated to us; Abu Shihab al-Hannat narrated to us, from al-Hajjaj ibn Artaʾah, from ʿAtaʾ, from ʿAʾisha, who said: “Ibn al-Zubayr urinated on the Prophet ﷺ, so I seized him harshly. The Prophet said, ‘Leave him; he has not yet eaten solid food, and his urine is harmless.’”

Al-Hajjaj: there is a degree of weakness in him.

As for the epithet “al-Musayyabi,” it comes from his uncle, the governor al-Musayyab ibn Zuhayr.