Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit.

hereby we know that we abide in him and he in us, because he hath given us of his Spirit.

In this we know that we abide in him, and he in us: because he hath given us of his spirit.

By this we know that we dwell in him, and he in us, because he hath given us of his Spirit.

in this we know that in Him we do remain, and He in us, because of His Spirit He hath given us.

We can know that we are continuing in union with Him and that He is continuing in union with us, by the fact that He has given us a portion of His Spirit.

And his Spirit which he has given us is the witness that we are in him and he is in us.

We know that we live in him, and he lives in us, because he has given us a measure of his Spirit.

Hereby know we that we dwell in him - Here is another, or an additional evidence of it.
Because he hath given us of his Spirit - He has imparted the influences of that Spirit to our souls, producing "love, joy, peace, long-suffering, gentleness, goodness, faith," etc., Galatians 5:22-23. It was one of the promises which the Lord Jesus made to his disciples that he would send the Holy Spirit to be with them after he should be withdrawn from them, John 14:16-17, John 14:26; John 15:26; John 16:7, and one of the clearest evidences which we can have that we are the children of God, is derived from the influences of that Spirit on our hearts. See this sentiment illustrated in the notes at Romans 8:16.

Hereby know we, etc. - See the note on 1-John 3:24.

Hereby know we that we dwell in him, and he in us,.... That there is a communion between God and us, and a communication of his love and grace to us, and an exercise of grace upon him; for God dwells in his people by his Spirit and grace, and they dwell in him by the exercise of faith and love upon him: and this is known,
because he hath given us of his Spirit: not of the essence and nature of the Spirit, which is the same with the nature of the Father and of the Son, and is incommunicable; but either of the gifts of the Spirit, which are divided to every man as he pleases, and which being bestowed on men, and used by them, for the profit and advantage of the church of God, show that God is with them, and dwells among them of a truth; or of the graces of the Spirit, such as faith, hope, and love, which are each the gifts of God; and these being bestowed and exercised, are proofs of the mutual indwelling of God and his people; See Gill on 1-John 3:24.

Hereby--"Herein." The token vouchsafed to us of God's dwelling (Greek, "abide") in us, though we see Him not, is this, that He hath given us "of His Spirit" (1-John 3:24). Where the Spirit of God is, there God is. ONE Spirit dwells in the Church: each believer receives a measure "of" that Spirit in the proportion God thinks fit. Love is His first-fruit (Galatians 5:22). In Jesus alone the Spirit dwelt without measure (John 3:34).