en_tn_condensed/isa/54/17.md

No weapon that is formed against you will succeed

"Enemies may form weapons to attack you but they will not defeat you"

This is the heritage of the servants of Yahweh

The reward that Yahweh will give to those who serve him is spoken of as if the reward were something they would inherit.

this is Yahweh's declaration

"this is what Yahweh has declared" or "this is what I, Yahweh, have declared"