The Prophet of Allah, sallallaahu ‘alayhi wa sallam, would not withhold a messenger who wanted to enter Islam

“Quraysh sent me (amessenger) to the Prophet of Allah, sallallaahu ‘alayhi wa sallam, and as soon as I saw him, Allah placed the religion of Islam in my heart. I said: ‘O Messenger of Allah, I will never go back to them!’ The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: ‘I do not break the agreement, nor do I keep the messengers.  Rather, go back, and if you feel the same way that you do now, then come back.’ So I went back and then returned to the Prophet of Allah, sallallaahu ‘alayhi wa sallam, and became MuslimAl-’Atheem Abaadi (a scholar) said: “This shows that an agreement must be honored with a disbeliever just as it must be honored with a Muslim.” Ibn Al-Qayyim (a scholar)) said: “From the Prophetic guidance is that he would not keep a messenger with him if he chose the religion of Islam, and forbid him to go back. Rather he would return him to them.”