King James Version
Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne;New International Version
But he was a prophet and knew that God had promised him on oath that he would place one of his descendants on his throne.Catholic Public Domain Version
Therefore, he was a prophet, for he knew that God had sworn an oath to him about the fruit of his loins, about the One who would sit upon his throne