no one classified him as a Companion except Ibn Saʿd.
ʿUbayd Allāh narrated from ʿUmar, ʿUthmān, ʿAlī, Kaʿb, and a number of others.
Those who transmitted from him include ʿUrwah, Ḥumayd ibn ʿAbd al-Raḥmān, ʿAṭāʾ ibn Yazīd al-Laythī, and Maʿmar ibn Abī Ḥabībah.
ʿUrwah ibn al-Zubayr related from ʿUbayd Allāh ibn ʿAdī that he once came in to see ʿUthmān while the latter was under siege and ʿAlī was leading the prayer. He said, “Commander of the Believers, I feel uneasy about praying with these people while you are the imam.”
ʿUthmān replied, “Prayer is the finest deed people perform; so when you see the people performing it well, perform it well with them.” (1)
ʿAṭāʾ ibn Yazīd said (2): “ʿUbayd Allāh ibn ʿAdī was among the jurists and scholars of Quraysh.”
Ibn Saʿd, in the first tier of the Medinan generation, states:
“ʿUbayd Allāh ibn ʿAdī the Elder, son of al-Khiyār; his mother was Umm Qitāl bint Usayd ibn Abī al-ʿĀṣ, an Umayyad.
He narrated from ʿUmar and ʿUthmān, and he owned a house in Medina.
He died during the caliphate of al-Walīd ibn ʿAbd al-Malik. He was reliable, though he transmitted only a few narrations.”
Abū Nuʿaym, however, said: “ʿAdī ibn al-Khiyār was killed at Badr as an unbeliever.” (3)
I say: On this basis, ʿUbayd Allāh must have seen the Prophet ﷺ.