en_tn_lite_do_not_use/exo/09/02.md

if you refuse to let them go, if you still keep them back

These two phrases mean basically the same thing. They will emphasize to Pharaoh what will happen if Pharaoh does this. Alternate translation: "if you continue refusing to let them go" (See: rc://en/ta/man/translate/figs-parallelism)