In regards to the first one, Gilgulim are first mentioned in the Heikhalot texts, also found in the Zohar, and Sefer HaBahir. That possibly puts According to those who hold the Zohar is Tannaic, that puts the idea at least as far back as Tannaim and Amoraim. Several of the Geonim argued over it, such as Sa'adia Gaon.
Isaac Moses
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In reality the date of authorship for these works is far from clear. addind "possibly" is more accurate
mevaqesh
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