# There is mourning everywhere

"There are people mourning everywhere"

# every flat roof

"every housetop"

# plazas

open public areas, such as open marketplaces

# For I have destroyed

The word "I" refers to Yahweh

# this is Yahweh's declaration

"this is what I, Yahweh, have declared". Yahweh speaks of himself to express the certainty of what he is declaring. See Jeremiah 1:8.