While holding the chair of Greek, was appointed extraordinary professor of theology, and gave exegetical lectures on the New Testament.
Besides definite works of this kind, there was also being formed during this period a large body of exegetical and legal material, for the most part orally transmitted, which only received its literary form much later.
In the 10th century Jacob al-Qirqisani wrote his Kitab al-anwar, on law, Solomon ben Yeruham (against Seadiah) and Yefet ben 'Ali wrote exegetical works; in the 11th century Abu'l-faraj Furgan, exegesis, and Yusuf al-Basir against Samuel ben Hophni.
Basilides wrote an exegetical work in twenty-four books on "his" gospel, but which this was is not known.
His family had been distinguished for piety and exegetical skill, but though he was known in the Jewish community by commentaries on certain books of the Bible, he never seems to have accepted any rabbinical post.
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