en_tn_condensed/2jn/01/09.md

Whoever goes on ahead

This refers to a person who claims to know more about God and truth than everyone else. Alternate translation: "Whoever claims to know more about God" or "Whoever disobeys the truth"

does not have God

"does not belong to God"

The one who remains in the teaching, this one has both the Father and the Son

"Someone who follows Christ's teaching belongs to both the Father and the Son"

the Father and the Son

These are important titles that describe the relationship between God and Jesus. (See: rc://en/ta/man/translate/guidelines-sonofgodprinciples)