Chrysostom on John 19:26-27,  "And He, having committed His mother to John, said, Behold your Son. O the honor! With what honor did He honor the disciple! When He Himself was now departing, He committed her to the disciple to take care of. For since it was likely that, being His mother, she would grieve, and require protection, He with reason entrusted her to the beloved. To him He says, Behold your mother. This He said, knitting them together in charity; which the disciple understanding, took her to his own home. But why made He no mention of any other woman, although another stood there? To teach us to pay more than ordinary respect to our mothers. For as when parents oppose us on spiritual matters, we must not even own them, so when they do not hinder us, we ought to pay them all becoming respect, and to prefer them before others, because they begot us, because they bred us up, because they bare for us ten thousand terrible things. And by these words He silences the shamelessness of Marcion; for if He were not born according to the flesh, nor had a mother, wherefore takes He such forethought for her alone?

Augustine: "A passage, therefore, of a moral character is here inserted. The good Teacher does what He thereby reminds us ought to be done, and by His own example instructed His disciples that care for their parents ought to be a matter of concern to pious children... How was it, then, that the disciple and servant received unto his own the mother of his Lord and Master, where no one called anything his own? Or, seeing we read a little further on in the same book, For as many as were possessors of lands or houses sold them, and brought the prices of them, and laid them down at the apostles' feet: and distribution was made unto every man according as he had need, are we not to understand that such distribution was made to this disciple of what was needful, that there was also added to it the portion of the blessed Mary, as if she were his mother; and ought we not the rather so to take the words, From that hour the disciple took her unto his own, that everything necessary for her was entrusted to his care? He received her, therefore, not unto his own lands, for he had none of his own; but to his own dutiful services, the discharge of which, by a special dispensation, was entrusted to himself."