{19} Little children, keep yourselves from idols. Amen.

(19) He expresses a plain precept of taking heed of idols: which he contrasts with the only true God, that with this seal he might seal up all the former doctrine.

People's New Testament

5:21 Keep yourselves from idols. Flee from idolatry, the besetting sin of that age. So too we need to flee from the idols of our age. Whatever takes our worship from God is an idol.

NOTE.--SIN IN THE FIRST EPISTLE OF JOHN. A comparison of passages will show that an extreme and false doctrine might be reached by pressing one class to the exclusion of another class. I give a list:

I. If we say that we have no sin, we deceive ourselves (1Jo 1:8). If we confess our sins, he is faithful and just to forgive us our sins (1Jo 1:9).If we say that we have not sinned, we make him a liar (1Jo 1:10). These things I write to you, that ye sin not (1Jo 2:1). If any man sinneth ( man is not in the Greek), we have an Advocate with the Father (1Jo 2:1). If any man shall see his brother sin a sin which is not to death (1Jo 5:16). There is a sin not to death (1Jo 5:17).

These passages all refer to Christians; they teach their liability to sin; show how they may obtain pardon, and show how also they should labor to save an erring brother. One the other hand, there is another class which teaches that the Christian is freed from sin.

II. The blood of Jesus his Son cleanseth from all sin (1Jo 1:7). Whoever abideth in him sinneth not (1Jo 3:6). He cannot sin because he is born of God (1Jo 3:9). Whoever is born of God sinneth not (1Jo 5:18).

If this second class of passages was alone considered, they would teach apparently the absolute holiness of the saint. The two classes are to be interpreted in the light of each other. They teach that the germ of sin, dormant, perhaps, remains in us as long as we are in the flesh. The flesh lusteth against the Spirit (Ga 5:17). We may be overtaken in a fault, the dormant germ waken, and we be betrayed into sin for the moment (Ga 6:1). The sin is due to the temporary revival of the old nature. The new nature, the spiritual being born of the new birth, is not disposed to sin, and will be destroyed if the sin is willful and continued. One born of God cannot engage in willful sin. Nor can he who abides in Christ. He who becomes a willful sinner does not abide in Christ, nor remains a child of God.

Wesley's Notes

5:21 Keep yourselves from idols - From all worship of false gods, from all worship of images or of any creature, and from every inward idol; from loving, desiring, fearing anything more than God. Seek all help and defence from evil, all happiness in the true God alone.

Jamieson-Fausset-Brown Bible Commentary

21. Affectionate parting caution.

from idols-Christians were then everywhere surrounded by idolaters, with whom it was impossible to avoid intercourse. Hence the need of being on their guard against any even indirect compromise or act of communion with idolatry. Some at Pergamos, in the region whence John wrote, fell into the snare of eating things sacrificed to idols. The moment we cease to abide "in Him that is true (by abiding) in Jesus Christ," we become part of "the world that lieth in the wicked one," given up to spiritual, if not in all places literal, idolatry (Eph 5:5; Col 3:5).

Matthew Henry's Concise Commentary

5:18-21 All mankind are divided into two parties or dominions; that which belongs to God, and that which belongs to the wicked one. True believers belong to God: they are of God, and from him, and to him, and for him; while the rest, by far the greater number, are in the power of the wicked one; they do his works, and support his cause. This general declaration includes all unbelievers, whatever their profession, station, or situation, or by whatever name they may be called. The Son leads believers to the Father, and they are in the love and favour of both; in union with both, by the indwelling and working of the Holy Spirit. Happy are those to whom it is given to know that the Son of God is come, and to have a heart to trust in and rely on him that is true! May this be our privilege; we shall thus be kept from all idols and false doctrines, and from the idolatrous love of worldly objects, and be kept by the power of God, through faith, unto eternal salvation. To this living and true God, be glory and dominion for ever and ever. Amen.