“And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.”
King James Version (KJV)
3:23 And this is his commandment - All his commandments in one word. That we should believe and love - in the manner and degree which he hath taught. This is the greatest and most important command that ever issued from the throne of glory. If this be neglected, no other can be kept: if this be observed, all others are easy.
1Jo 3:23 And this is his commandment. The commandments may be summed up in one, with two parts, viz.: Faith in Jesus Christ, and love of the brethren.