Marcos 6

Marcos 6:3

And yet some very depraved men take from this the basis of their view that there were many brothers of our Lord as a point of tradition. If there had been sons of Mary who were not rather produced from a previous marriage of Joseph's, Mary never would have been transferred to the apostle John as his mother at the time of the Passion, nor would the Lord have said to them both, "Woman, behold your son," and to John, "Behold your mother," [John 19:26-27] unless perhaps he was leaving his disciple's filial love in order to comfort her who was left behind. — Commentary on Matthew verse 1:4, page 45-46