In the name of Allah, the Most Gracious, the Most Merciful
In the name of God the Beneficent, the Merciful: (This letter is) from Muhammad son of Abdullah to Heraclius the Great (ruler) of the Romans (Byzantines). Peace be upon him, he who follows the right path. Furthermore I invite thee to Islam; become a Muslim and thou shalt be safe (from Hell or God's punishment), and God will double thy reward (as your people will follow along and be saved because of you), and if thou rejectest, thou shalt bear the sins of the Arisiyins (the peasants, your people).
(And I recite to you God's Statement:) Say (O Muhammad): 'O people of the scripture! Come to a word common to you and us that we worship none but God and that we associate nothing in worship with Him, and that none of us shall take others as Lords beside God. Then, if they turn away, say: 'Bear witness that we are Muslims' (those who have surrendered to God).
“ من محمد بن عبد الله إلى هرقل عظيم الروم: سلام على من اتبع الهدى، أما بعد فإنى أدعوك بدعوة الإسلام . أسلم تسلم ويؤتك الله أجرك مرتين ، فإن توليت فإن عليك إثم الأريسيِّين. {قل يا أهل الكتاب تعالوا إلى كلمة سواء بيننا وبينكم ألا نعبد إلا الله ،ولا نشرك به شيئا،ولا يتخذ بعضنا بعضا آربابا من دون الله فإن تولوا فقولوا اشهدوا بأنا مسلمون
