1)
What are "Nechushtayim"?
1.
Radak (Yirmeyah 39:7): They are iron leg shackles. It uses an expression of Nechoshes, for they were of copper 1 . Alternatively, they were from a strong iron called Nechoshes.
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If so, why did he say that they are iron? Perhaps he means that they are like shackles normally made of iron. (PF)