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, as in Joh 6:56; that is, by faith; who under a sense of sin and danger have fled to Christ, as to a strong tower and place of defence, where they dwell safely, peaceably, pleasantly, and comfortably, enjoying whatever is necessary for them.
The Syriac and Ethiopic versions read, "he that saith I am in him"; loved by him, chosen in him, united to him, a member of his, and have communion with him:ought himself also to walk even as he walked; as Christ walked, lived, and acted, so ought he; that is, to imitate him and follow him, as he has him for an example; not in his miraculous works in raising the dead, healing the sick, and walking upon the waters, &c.
which were wrought as proofs of his deity and of his Messiahship, and not intended for imitation; nor in his mediatorial performances, as in his propitiatory sacrifice and advocacy; but in the exercise of grace, and duties of religion as a man, and in a private way; and may chiefly regard walking in love, as he walked, see Eph 5:2; and is what is in the following verses insisted on, namely, the new commandment of love to the brethren; which should be to all as his was, and, like his, constant and lasting; and, when the case requires, should be shown by laying down life for them.