The Lord is giving one command in two different ways to emphasize that Paul should certainly continue preaching. AT: "You must not be afraid and, instead, continue to speak and not become silent" (See: [[rc://en/ta/man/translate/figs-parallelism]])
The Lord gives the same command in two different ways to strongly command Paul to speak. AT: "you must certainly continue to speak" (See: [[rc://en/ta/man/translate/figs-doublet]])
It can be stated explicitly what the Lord wants Paul to speak. AT: "do not stop speaking about the gospel" (See: [[rc://en/ta/man/translate/figs-explicit]])
This is a concluding statement for this part of the story. "Word of God" here is a synecdoche for the entire scriptures. AT: "Paul lived there ... teaching the scriptures among them" (See: [[rc://en/ta/man/translate/writing-endofstory]] and [[rc://en/ta/man/translate/figs-synecdoche]])