# In that day

"At that time" or "When this happens." This phrase here refers to the time of peace and restoration that immediately follows the day of Yahweh.

# say to Jerusalem ... Zion

The names of these cities here refer to the people who live in them. AT: "say to the people of Jerusalem ... people of Zion" (See: [[rc://en/ta/man/translate/figs-metonymy]])

# Do not let your hands falter

To feel weak or helpless is spoken of as if their hands became physically weak. Here "hands" represents the whole person. AT: "Do not become weak" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-synecdoche]])