The Prophet (ﷺ) wrote a letter to Heraclius: "From Muhammad, the Messenger of Allah, to Hiraql (Heraclius), Chief of the Byzantines. Peace be to those who follow the guidance." Ibn Yahya reported on the authority of Ibn Abbas that AbuSufyan said to him: We then came to see Hiraql (Heraclius) who…
سَلاَمٌ عَلَى مَنِ اتَّبَعَ الْهُدَى "