To "ransom" means to "rescue." This refers to people whom Yahweh has rescued. AT: "Those whom Yahweh has rescued" (See: [[rc://en/ta/man/translate/figs-nominaladj]])
This uses a person's head to mean the person as a whole. AT: "they will have everlasting joy" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
# gladness and joy ... sorrow and sighing
The words "gladness" and "joy" mean basically the same thing, as do "sorrow" and "sighing." Together they emphasize the intensity of these emotions. (See: [[rc://en/ta/man/translate/figs-doublet]])
# gladness and joy will overtake them
This speaks of the people being overwhelmed by gladness and joy by giving these emotions the human quality of being able to overtake someone by force. AT: "they will be overwhelmed by joy and gladness" (See: [[rc://en/ta/man/translate/figs-personification]])
This speaks of the people no longer being sorrowful and sighing by giving these emotions the human ability to run away. AT: "they will no longer be sorrowful and sighing" (See: [[rc://en/ta/man/translate/figs-personification]])