Israel. Not Jacob, because this is the language of highest faith.
swarest. Figure of speech Anthropopatheia (App-6). Compare Hebrews 6:13; Hebrews 6:17; Genesis 22:16-18.
as the stars. Figure of speech Paroemia (App-6).
Related Commentaries of Exodus 32:13
Exodus 32:13
13 Remember Abraham, Isaac, and Israel, thy servants, to whom thou swarest by thine own self, and saidst unto them, I will multiply your seed as the stars of heaven, and all this land that I have spoken of will I give unto your seed, and they shall inherit it for ever.