That God hath given us eternal life Having now set forth the benefit, he invites us to believe. It is, indeed, a reverence due to God, immediately to receive, as beyond controversy, whatever he declares to us. But since he freely offers life to us, our ingratitude will be intolerable, except with prompt faith we receive a doctrine so sweet and so lovely. And, doubtless, the words of the Apostle are intended to shew, that we ought, not only reverently to obey the gospel, lest we should affront God; but, that we ought to love it, because it brings to us eternal life. We hence also learn what is especially to be sought in the gospel, even the free gift of salvation; for that God there exhorts us to repentance and fear, ought not to be separated from the grace of Christ. But the Apostle, that he might keep us together in Christ, again repeats that life is found in him; as though he had said, that no other way of obtaining life has been appointed for us by God the Father. And the Apostle, indeed, briefly includes here three things: that we are all given up to death until God in his gratuitous favor restores us to life; for he plainly declares that life is a gift from God: and hence also it follows that we are destitute of it, and that it cannot be acquired by merits; secondly, he teaches us that this life is conferred on us by the gospel, because there the goodness and the paternal love of God is made known to us; lastly, he says that we cannot otherwise become partakers of this life than by believing in Christ.

And this is the record - This is the sum, or the amount, of the testimony (μαρτυρία marturia) which God has given respecting him.
That God hath given to us eternal life - Has provided, through the Saviour, the means of obtaining eternal life. See the notes at John 5:24; John 17:2-3.
And this life is in his Son - Is treasured up in him, or is to be obtained through him. See the John 1:4; John 11:25; John 14:6 notes; Colossians 3:3 note.

This is the record - The great truth to which the Spirit, the water, and the blood bear testimony. God hath given us eternal life - a right to endless glory, and a meetness for it. And this life is in his Son; it comes by and through him; he is its author and its purchaser; it is only in and through Him. No other scheme of salvation can be effectual; God has provided none other, and in such a case a man's invention must be vain.

(12) And this is the record, that God hath given to us eternal life, and this life is in his Son.
(12) Now at length he shows what this testimony is that is confirmed with so many witnesses: that is, that life or everlasting happiness is the gift of God, which is the Son, and proceeds from him to us, who by faith are joined with him, so that without him, life is nowhere to be found.

And this is the record,.... The sum and substance of it, with respect to the person of Christ, and the security of salvation in him, who is the true God, and eternal life:
that God hath given to us eternal life; which is a life of glory and happiness hereafter; in the present state is unseen, but will in the world to come be a life of vision, free from all the sorrows and imperfections of this; and will be of the utmost perfection and pleasure, and for ever. This is a pure free grace gift of God the Father, proceeding from his sovereigns good will and pleasure, and which he gives to all his chosen ones, for they are ordained unto eternal life; to as many as he has given to his Son; to all that are redeemed by his blood, and are brought to believe in him: to these he gave it in his Son before the world began; and to the same in time he gives the right unto it, the meetness for it, and the pledge and earnest of it; and will hereafter give them the thing itself, the whole of it, to be possessed and enjoyed by them in person, to all eternity.
And this life is in his Son: not only the purpose and promise of it, but that itself; Christ asked it of his Father in the covenant of peace, and he gave it to him, that he might have it in himself for all his people; and here it is safe and secure, it is hid with Christ in God, it is bound up in the bundle of life with him; and because he lives, this life will never be lost, or they come short of it.

hath given--Greek, aorist: "gave" once for all. Not only "promised" it.
life is in his Son--essentially (John 1:4; John 11:25; John 14:6); bodily (Colossians 2:9); operatively (2-Timothy 1:10) [LANGE in ALFORD]. It is in the second Adam, the Son of God, that this life is secured to us, which, if left to depend on us, we should lose, like the first Adam.

This is the witness (Revision). God gives us eternal life through this Son. We know that we have it because we know that we have a new life.
He that hath the Son hath life. We lay hold of the Son by faith in him and thus come to life.
These things have I written. He writes that they may understand how they may know that they have eternal life. Tests have been given. For example, see 1-John 5:1-2; 1-John 4:13, etc.
That ye may believe. Put the fullest trust in the name of Christ.

And this is the sum of that testimony, that God hath given us a title to, and the real beginning of, eternal life; and that this is purchased by, and treasured up in, his Son, who has all the springs and the fulness of it in himself, to communicate to his body, the church, first in grace and then in glory.