Khaybar.

The Messenger of Allah ﷺ said, “For you there are two emigrations: you emigrated to the Negus, and you emigrated to me.” (1)

In another wording: “My two brothers—Abū Ruhm and Abū Burdah—and I; I was the youngest of them.”

Ahmad transmitted: Yaḥyā ibn Isḥāq narrated to us; Yaḥyā ibn Ayyūb narrated to us, from Ḥumayd, from Anas, who said:
“The Messenger of Allah ﷺ said, ‘Tomorrow a people will come to you whose hearts are softer toward Islam than yours.’

The Ashʿarites arrived, and when they drew near they began to chant:
‘Tomorrow we shall meet the loved ones—
Muhammad and his company.’

When they reached the Prophet, they greeted one another by shaking hands, and they were the first to introduce handshaking. (2)

Shuʿbah narrated from Simāk, from ʿIyāḍ al-Ashʿarī, who said: When the verse, “then Allah will bring a people He loves and who love Him” (al-Māʾidah 5:54), was revealed, the Messenger of Allah ﷺ said, “They are your people, O Abū Mūsā,” and he gestured toward him. (3)

Al-Ḥākim declared the report sound, and the stronger view is that ʿIyāḍ ibn ʿAmr was a Companion. A group of narrators also transmitted it from Shuʿbah (h).

ʿAbdullāh ibn Idrīs narrated from his father—both of them—from Simāk, from ʿIyāḍ, from Abū Mūsā.

Burayd narrated from Abū Burdah, from Abū Mūsā, who said: “When the Messenger of Allah ﷺ had finished with Hunayn, he dispatched Abū ʿĀmir al-Ashʿarī in command of the army to Awtās, where he met Durayd ibn…"