“Brethren, I write no new commandment unto you, but an old commandment which ye had from the beginning. The old commandment is the word which ye have heard from the beginning.”
King James Version (KJV)
2:7 When I speak of keeping his word, I write not a new commandment - I do not speak of any new one. But the old commandment, which ye had - Even from your forefathers.
1Jo 2:7 I write no new commandment unto you. He writes in substance what was commanded from the beginning when he bids them walk as Christ walks. The old commandment is the word which ye have heard. The Gospel. Its substance is condensed by Christ into the words: "Follow me". From the beginning. Their first hearing of the gospel.