The words "gentle waters" are a metaphor for the law of the Lord. AT: "Because this people has rejected Yahweh's law, which is like the gentle waters of Shiloah" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/translate-names]])
"this people group." If your language needs a plural here, you can translate this phrase and the following verbs as "these people have refused ... are happy."
The full meaning can be made explicit. See how you translated these men's names in [Isaiah 7:1](../07/01.md). AT: "is happy that the armies of Assyria have defeated Rezin, king of Aram, and Pekah, Remaliah's son, king of Israel" (See: [[rc://en/ta/man/translate/figs-explicit]])
Yahweh speaks of himself as if he were someone else to remind the people of who he is. AT: "therefore I, the Lord, am" (See: [[rc://en/ta/man/translate/figs-pronouns]])
# the waters of the River, mighty and many, the king of Assyria and all his glory
The river symbolizes the army of Assyria. AT: "the army from Assyria, which is powerful like a mighty river" (See: [[rc://en/ta/man/translate/figs-metaphor]])