shackles

metal restraints used to fasten a prisoner's wrists or ankles together

His feet were bound by shackles; on his neck was put an iron collar

These statements can be restated as active. Alternate translation: "The Egyptians bound his feet in shackles; they put an iron collar around his neck. (See: rc://en/ta/man/translate/figs-activepassive and rc://en/ta/man/translate/figs-explicit)