[130] [cap.23] Having now discussed at sufficient length the subject of the change and alteration of names, we will turn to the matters which come next in order in our proposed examination. Immediately after the events which we have just mentioned, [87] [88] came the birth of Isaac; for after God had given to his mother the name of Sarrah instead of Sarah, he said to Abraham, "I will give unto thee a son." [89] We must consider each of the things here indicated particularly.