9. Where is Sarah? Hitherto God permitted Abraham to discharge an obvious duty. But, having given him the opportunity of exercising charity, God now begins to manifest himself in his angels. The reason why Moses introduces, at one time, three speakers, while, at another, he ascribes speech to one only, is, that the three together represent the person of one God. We must also remember what I have lately adduced, that the principal place is given to one; because Christ, who is the living image of the Father, often appeared to the fathers under the form of an angel, while, at the same time, he yet had angels, of whom he was the Head, for his attendants. And as to their making inquiry respecting Sarah; we may hence infer, that a son is again here promised to Abraham, because she had not been present at the former oracle.