If you had spent all that is in the earth, you could not have brought their hearts together; but Allah brought them together.

     And if they incline to peace, then incline to it [also] and rely upon Allah. Indeed, it is He who is the Hearing, the Knowing. But if they intend to deceive you - then sufficient for you is Allah. It is He who supported you with His help and with the believers and brought together their hearts. If you had spent all that is in the earth, you could not have brought their hearts together; but Allah brought them together. Indeed, He is Exalted in Might and Wise. O Prophet, sufficient for you is Allah and for whoever follows you of the believers. 

THE QUR'AN, al-Anfal 8:61-64