en_tn/isa/05/26.md

He will lift up a signal flag for a far away nation and will whistle for them from the end of the earth

Isaiah says the same thing in two different ways to emphasize that God will use another nation to punish his people. Alternate translation: "He will call for the army of a nation that is far away from Judah and tell them to come." (See: rc://en/ta/man/translate/figs-parallelism)

They will come

"The enemy army will come"

speedily and promptly

These words mean basically the same thing and are used for emphasis. Alternate translation: "very quickly." (See: rc://en/ta/man/translate/figs-doublet)