‏ Numbers 21:9

9Therefore, Moses made a bronze serpent, and he placed it as a sign. When those who had been struck gazed upon it, they were healed.
21:9 A brazen serpent: This was a figure of Christ crucified, and of the efficacy of a lively faith in him, against the bites of the hellish serpent. John 3.14.(Challoner)

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