You may believe that Judaism had no concept of the devil at that time, but obviously he didn't know that and/or doesn't subscribe to that idea
More to the point, Judaism
does have a concept of "a satan" but no concept of "The Devil" or "Satan" as a Christian thinks of it.
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Does Judaism Believe in Satan?
Page not found – What Jews Believe
http://www.geocities.com/~alyza/Jewish/satan.html
From this site:
Alternative Religions
Is it true that in Judaism that Satan is viewed as one of God's angels?
Largely, yes. It is not unusual for Jewish believers to aver that Satan, unlike his Christian counterpart, is a loyal servant of God, rather than an egotistical evildoer. Satan means "accuser" in Hebrew, and in many instances of Jewish belief, he acts as a sort of judge and prosecutor, rooting out flaws in God's creation. He tempts Adam and Eve not to destroy them, but to further God's plans for the universe. Christian authors have taken a decidedly different view of Satan as an adversary of God and mankind.
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Asgara
"An unexamined life is not worth living" Socrates via Plato