en_tn/1jn/02/22.md

Who is the liar but the one who denies that Jesus is the Christ?

"Who is the liar? Anyone who denies that Jesus is the Christ." John used a question to emphasize who liars are. Alternate translation: "The one who denies that Jesus is the Christ is the liar" (See: rc://en/ta/man/jit/figs-rquestion)

denies that Jesus is the Christ

"refuses to say that Jesus is the Christ" or "says that Jesus is not the Messiah"

denies the Father and the Son

"refuses to say the truth about the Father and the Son" or "rejects the Father and the Son."

Father ... Son

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