Here the word "you" is plural and refers to the people to whom John wrote as well as all believers. The word "he" is emphatic and refers to Christ. (See: [[rc://en/ta/man/translate/figs-you]])
"remember and believe what you have heard from the beginning." How they heard it, what they heard, and what "the beginning" means can be made explicit: AT: "continue to trust what we have taught you about Jesus just as you have trusted since you first became believers" (See: [[rc://en/ta/man/translate/figs-explicit]])
"This is what he promised to give us—eternal life" or "He has promised to cause us to live forever"
# life
The word "life" throughout this letter refers to more than physical life. It stands here for Jesus, the eternal life. See how you translated this in [1 John 1:1-2](../01/01.md). (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "lead you astray" is a metaphor for persuading someone to believe something that is not true. AT: "those who want to deceive you" or "those who want to make you believe lies about Jesus Christ" (See: [[rc://en/ta/man/translate/figs-metaphor]])