"this is what Yahweh, the God of hosts, the Lord says"
# Wailing will be in all the squares
"People will wail in all the town squares"
# Wailing
long, loud, sad cries
# the squares
broad open places in the town where people gather
# the mourners to wail
The phrase "they will call" is understood from the beginning of the sentence. AT: "they will call the mourners to wail" (See: [[rc://en/ta/man/translate/figs-ellipsis]])