# Yahweh will roar from Zion; he will raise his voice from Jerusalem

These two phrases share similar meanings. Together they emphasize that Yahweh shouts loudly as he prepares to judge the nation. 

# Yahweh will roar

The author speaks of the voice of Yahweh as if it sounded like the roar of a lion or the roar of thunder. 

# Yahweh

This is the name of God that he revealed to his people in the Old Testament.