De Mutatione Nominum (eng)
The text interprets Genesis 17:1–5 and 16–22, employing allegorical methods of interpretation. Concepts derived from non-Jewish philosophy are used to elucidate the “deeper meaning” of the biblical passages.
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"Abraham was ninety and nine years old; and the Lord appeared unto Abraham, and said unto him, I am thy God." The number of nine, when added to the number ninety, is very near to a hundred; in which number the self-taught race shone forth, namely Isaac, the most excellent joy of all enjoyments; for he was born when his father was a hundred years old.