How would Joseph Smith know that Abraham possessed the Urim and Thummim?

In Abraham 3:1 we read:

And I, Abraham, had the Urim and Thummim, which the Lord my God had given unto me, in Ur of the Chaldees;

Jeff Lindsay remarks:

The Book of Abraham teaches that Abraham possessed the Urim and Thummim, which we understand to be stone-like tools that allow seers and prophets to see things with divine power (Abr. 3:1-2). Abraham learned of the stars and of God’s works through these tools. A parallel comes from the kabbalistic work, the Bahir, compiled in the twelfth century but attributed to Rabbis from the first century and earlier. It says that God created a precious stone that “included all the commandments” in it. God, seeking to give “a power” to Abraham, gave him the precious stone, though Abraham did not want it. The Babylonian Talmud reports that:
R. Eliezer the Modiite said that Abraham possessed a power of reading the stars for which he was much sought after by the potentates of East and West. R. Simeon b. Yohai said: Abraham had a precious stone hung round his neck which brought immediate healing to any sick person who looked on it . . .” (p. 123).
– Jeff Lindsay – Questions about the Book of Abraham, Part 3: Does It Agree with other Ancient Texts?

Where would Joseph Smith have learned this?

See:

Jeff Lindsay – Questions about the Book of Abraham, Part 3: Does It Agree with other Ancient Texts?

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