Whoever claims to abide in Him must walk as Jesus walked.
6 He that saith he abideth in him As he has before set before us God as light for an example, he now calls us also to Christ, that we may imitate him. Yet he does not simply exhort us to imitate Christ; but from the union we have with him, he proves that we ought to be like him.
These verses may seem to relate to the seventh verse of the former chapter, between which and these verses there occurred an incidental discourse concerning the believer's duty and relief in case of sin, occasioned by the mention of one of the believer's privileges - his being cleansed from sin by the Mediator's blood.
Commenting on 1 John 2:3-6
He that saith he abideth in him,.... As all do that are in him; once in Christ, and always in Christ; they are set as a seal on his arm and heart, which can never be removed; they are in his arms, and can never be plucked from thence; and are members of him, and can never be disunited from him: or dwelleth in him...