John Gill Commentary John 19:26

"When Jesus therefore saw his mother, and the disciple standing by whom he loved, he saith unto his mother, Woman, behold thy son!" — John 19:26 (ASV)

When Jesus therefore saw his mother
Standing near him, within the reach of his voice, as well as sight, he took notice of her, and showed a concern for her temporal, as well as for her eternal good:

and the disciple standing by ;
either by his cross, his mother, or both:

whom he loved :
meaning John, the writer of this Gospel, who for modesty's sake often describes himself in this manner; he being distinguished by Christ from the rest, by some peculiar marks of affection as man; though as God, and as the Redeemer, he loved his disciples alike, as he does all his true and faithful followers:

he says unto his mother, woman, behold your son ;
meaning not himself, but the disciple, who was her son, not by nature, nor adoption; but who would show himself as a son, by his filial affection for, care of, honour and respect unto her. Christ calls her not mother, but woman; not out of disrespect to her, or as ashamed of her; but partly that he might not raise, or add strength to her passions, by a tenderness of speaking; and partly to conceal her from the mob, and lest she should be exposed to their rude insults; as also to let her know that all natural relation was now ceasing between them; though this is a title he sometimes used to give her before.