en_tn/1jn/05/16.md

his brother

"fellow believer"

life

The word "life" throughout this letter refers to more than physical life. Here "life" refers to being alive spiritually. See how you translated this in 1 John 1:1. (See: rc://en/ta/man/translate/figs-abstractnouns)

death

This refers to eternal death, that is, eternity spent away from God's presence.