3:14 In view of these wonderful prospects, Zephaniah called the people of Jerusalem and all the Israelites to shout for joy with all their hearts.
"Although the command is aimed at the future Jerusalem, no doubt the message would not be lost on the godly worshipers of Zephaniah's own day."27
The phrase "daughter of"is a way of referring to the citizens of Zion (Jerusalem) as the children of the city. Children born in any city are the children of that city in a metaphorical sense as well as the children of their physical parents in a literal sense.
3:15 The reason for rejoicing is that Yahweh will have removed His judgment and Israel's enemies from her (cf. vv. 8, 19). Yahweh, Israel's true and omnipotent king, will be in the midst of His people (in the person of Messiah, Jesus Christ, during the Millennium; v. 17; cf. Isa. 9:7; 44:6; Zech. 14:9). Consequently they will fear disaster no more (v. 13).
3:16-17 In that day of blessing the people of Jerusalem will have plenty of reasons not to fear. One reason is that Yahweh their God will be in their midst (v. 15). He will be a victorious warrior having defeated all His enemies and all opposition worldwide (1:2-3; 3:8). Like a bridegroom He will take joy in His people Israel, and they will rest quietly in the security of His love for them as His bride. Yahweh will even shout with joy over His beloved Israel!
"We can find hope in times of difficulty if we focus on God's power, God's deliverance, and God's love. He is our King (3:15), our Savior (3:16-17a0, and our Beloved (3:17b)."28