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  • English_Biography_of_the_Prophet, page : 12

In 616 CE Prophet Muhammad, (salla Allahu alihi was sallam), sent his messenger, Dihyah Al Kalbi, with a letter to Heraclius inviting him to Islam.

Before Dihyah arrived with the invitation from the Prophet, (salla Allahu alihi was sallam), Heraclius had a very clear dream, a vision that he could not dismiss. In the vision he was told that a prophet had appeared among those who were circumcised. Heraclius was pious and aware of Jesus' prophecy that a new prophet would be sent, "And when Jesus, the son of Mary said, 'Children of Israel, I am sent to you by Allah to affirm the Torah that was before me, and to give news of a Messenger (Prophet Muhammad) who will come after me’" (Koran 61:6). Heraclius asked those close to him if they knew of any who practiced circumcision but they replied the only ones they knew were the Jews.

Now that he had received the letter from the Prophet, (salla Allahu alihi was sallam), Heraclius was indeed anxious to read it:

@PROPHET MUHAMMAD’S LETTER TO HERACLIUS
In the Name of Allah, the Merciful, the Most Merciful.
From: The Messenger of Allah
To: Heraclius, the greatest of Romans
"Peace be upon those who follow Divine Guidance.
I therefore, invite you to embrace Islam. Surrender to Allah and live in peace.
Allah will doubly reward you, but if you turn away, the sin of the 'Arisiyin
(those under Heraclius' domain) will rest upon you." Then he quoted the Koran:

'Say: People of the Book! (Jews, Nazarenes and Christians)
Let us come to a common word between us and you,
that we will worship none except Allah, that we will associate none with Him,