en_tn_condensed/isa/19/04.md

I will give the Egyptians into the hand of a harsh master

Here "hand" refers to power or control. Alternate translation: "I will give the Egyptians over to the control of a harsh master" (See: rc://en/ta/man/translate/figs-metonymy)

this is the declaration of the Lord Yahweh of hosts

Yahweh speaks of himself by name to express the certainty of what he is declaring. Translate as in Isaiah 3:15. Alternate translation: "this is what the Lord Yahweh of hosts has declared" or "this is what I, the Lord Yahweh of hosts, have declared" (See: rc://en/ta/man/translate/figs-123person)