Book of 1 John Chapter 3 Vs. 3

 Father hath Bestowed.

I John 3:3 "And every man that hath this hope in him purifieth himself, even as he is pure."

every man that... The hope of the rapture is an incentive to purify one’s self even as Christ is pure (1Jhn. 3:3; 1:7, 1:9; 2:6; 3:5-10; 5:1-4, 5:18). At Christ’s coming His followers will be transformed, but in the meantime, they need to be diligent in growth in holiness – He is pure, and it is the pure in heart who shall see God (Mat. 5:8).

every man that hath (πᾶς ὁ ἔχων)

A characteristic form of expression with John, containing a reference to some who had questioned the application of a general principle in particular cases. Here to some persons who had denied the practical obligation to moral purity involved in their hope. See 1Jhn. 3:4, 3:6, 3:9, 3:10, 3:15, 3:23, 3:24; 4:7; 5:1, 5:4, 5:18; 2Jhn. 1:9.

hope...

John's only reference to Christian hope. The phrase used here, to have the hope upon one, is unique in the New Testament. Compare ἐπ' αὐτῷ ἔθνη ἐλπιοῦσιν on Him shall the Gentiles hope (Rom. 15:12): ἠλπίκαμεν ἐπὶ Θεῷ ζῶντι we have hoped on the living God (1Tim. 4:10). On the force of ἔχων, see on John 16:22.

him purifieth himself... This is the key verse to 2:28-3:3 and introduces the fifth feature of the believer’s hope in this section. Living in the reality of Christ’s return makes a difference in a Christians’ behavior.

in Him (ἐπ' αὐτῷ)

Ambiguous. Better, as Rev., set on Him.

purifieth himself (ἁγνίζει ἑαυτόν)

On the verb, see on 1Pet. 1:22; see on Jas. 4:8. In the Septuagint used only of ceremonial purification, and so four out of the seven instances in which it occurs in the New Testament (John 11:55; Acts 21:24, 21:26; 24:18). In the remaining cases, of purifying the heart and the soul (Jas. 4:8; 1Pet. 1:22). The kindred adjective ἁγνός pure, has a moral signification in every case, as has the noun ἁγότης pureness (only 2Cor. 6:6). Ἁγνισμός purification (only Acts 21:26), ceremonial.

even as he...

Twenty Proofs Purity Is Now Possible

1. He shall save ... from ... sins (Mat. 1:21).

2. For the remission of sins (Mat. 26:28)

3. Dead to sin (Rom. 6:2)

4. Body of sin might be destroyed, that we should not serve sin (Rom. 6:6).

5. Reckon selves dead to sin (Rom. 6:11).

6. Let not sin reign in your body (Rom. 6:1-23).

7. Sin shall not have dominion over you (Rom. 6:14-23).

8. Being made free from sin (Rom. 6:18)

9. Made me free from sin (Rom. 8:1-4)

10. They that are Christ’s have crucified the flesh with the affections and lusts (Gal. 5:16, 5:24).

11. That we should be holy and without blame before Him in love (Eph. 1:4).

12. Live soberly, righteously, and godly in this present world (Tit. 2:12).

13. Purged our sins (Heb. 1:3; 9:14)

14. Be ye holy; for I am holy (1Pet. 1:16).

15. The blood of Jesus Christ cleanseth us from all sin (1Jhn. 1:7, 1:9).

16. Ought to walk even as He walked (1Jhn. 2:6).

17. Whosoever abideth in Him sinneth not . . . is righteous, even as He is (1Jhn. 3:6-7).

18. He that committeth sin is of the devil (1Jhn. 3:8-10; John 8:44).

19. Whoever is born of God sinneth not (1Jhn. 4:17; 5:4-5, 5:18).

20. Without holiness no man shall see the Lord (Heb. 12:1-29:15:4-15).

He (ἐκεῖνος)

Christ, as always in the Epistle.

pure (ἁγνός)

See above. Though marking moral and spiritual purity, and that of a very high grade, since it is applied to Christ here, yet it admits the thought of possible temptation or pollution, thus differing from ἅγιος, which means absolutely holy. Hence ἁγνός cannot properly be applied to God, who is ἅγιος; but both may be used of Christ, the latter in virtue of His human perfection.

Since Christians someday will be like Him, a desire should grow within the Christian to become like Him now. This was Paul’s passion expressed in Phil. 3:12-14. That calls for a purifying of sin, in which we play a part.

The hope, spoken of here, is the hope of the resurrection. The Christian should not put too much value on this world, but on the world to come. Christians should endeavor to be more Christ-like every day. Notice, it is in the will of man to purify himself. If our Leader Jesus is pure, then we must attempt to be pure, also.

But pending that event it is already true that everyone who has this hope in Him the pronoun probably refers to Christ, the Object of this hope purifies himself, just as He is pure. Here the writer probably continued to refer to the new birth. One who sets his hope by faith on the Son of God experiences an inward purification that is as complete as Christ’s own purity just as He is pure. John thus prepared the ground for the assertions he would soon make (1Jhn. 3:6, 3:9). New birth involves a perfect purification from sin.