ISB ~ 1 John 3 v23

his commandment:The demands of faith and love that direct us to God (Jn 14:1) and our neighbor (Jn 15:12).

believe in the name:i.e., believe in the Person signified by the name. Faith in the name of Jesus implies acceptance of the truth of his identity, namely, that he is “the Christ” (5:1) and “the Son of God” (5:5). The same teaching appears in the Gospel of John (e.g., Jn 1:49; 7:41; 11:27; 20:31).