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The Talmud, Sanhedrin 43a

Tacitus, Annals 15.44

Josephus, Antiquities 18:63-64

Josephus, Antiquities 20:9.1

Lucian, The Passing of Peregrinus

Pliny, Letters 10.96-97

Please note that this is not a comprehensive list of all the historical references to Jesus. These are just to get you started. If you’ve got more, feel free to add to ’em in a comment.