We now see the import of the text; but he emphatically adds, The oaths of the tribes; for hereby he more fully confirms that God had not then assisted the children of Abraham, so as to discard them afterwards; but that he had really proved how true he was in his promises; for by the oaths of (or to) the tribes he means the covenant that God had made not only with Abraham, but also with his posterity for ever. He puts oaths in the plural number, because God had not only once promised to be a God to Abraham and to his seed, but had often repeated the same promise, in order that faith might be rendered more certain, inasmuch as we have need of more than one thing to confirm us. For we see how our infirmity always vacillates, unless God supplies us with many props. As, then, God had often confirmed his servant Abraham, the Prophet speaks here of his oaths: but then as to the substance, the oath of God is the same; which was, that he had taken the race of Abraham under his protection, and promised that they should be to him a peculiar people, and, especially, that he had united the people under one head; for except Christ had been introduced, that covenant of God would not have been ratified nor valid. As, then, God had once included every thing when he said to Abraham, “I am God Almighty, and I shall be a God to you and to your children;” it is certain that nothing was added when God afterwards confirmed the faith of Abraham: but yet the Prophet does not without reason use the plural number; it was done, that the faithful might recomb with less fear on God’s promise, seeing, that it had been so often and by so many words confirmed.