en_tn/1co/14/21.md

In the law it is written,

This can be stated in active form. Alternate translation: "The prophet wrote these words in the law:" (See: rc://en/ta/man/jit/figs-activepassive)

By men of strange tongues and by the lips of strangers

These two phrases mean basically the same thing and are used together for emphasis. (See: rc://en/ta/man/jit/figs-parallelism)