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1 John 3:9

The reason the Son of God appeared was to destroy the works of the devil. No one born of God makes a practice of sinning, for God’s seed abides in him; and he cannot keep on sinning, because he has been born of God. ESV
For this purpose the Son of God was manifested, that He might destroy the works of the devil. Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God.NKJV

Cannot sin. Or, “is not able to go on sinning,” or “is not able to go on habitually sinning.” This does not mean that the Christian is incapable of committing a wrong act. If he were unable to sin, there would be no virtue in his being without sin, and there would be no true development of character. John has already implied that he will make occasional mistakes (see on ch. 2:1). The passage means that, having been born of God, and having God’s life-giving power dwelling in him, he cannot continue his old pattern of habitual sin. He now follows the sinless ideals that have been implanted in his soul by the new birth.