## your neck muscles tight as iron, and your forehead like bronze ##
"you have stiff necks and hard heads." Both of these phrases mean the people were stubborn. (See: [[rc://en/ta/man/translate/figs-simile]] and [[rc://en/ta/man/translate/figs-doublet]])
## I declared these things to you beforehand; before they happened I informed you ##
This is also saying the same thing twice for emphasis. (See: [[rc://en/ta/man/translate/figs-parallelism]])