John Chrysostom — as excerpted in the Catena Aurea on Luke 1:5-7

“(ex Hom. in Gen. 49.) Not only Elisabeth, but the wives of the Patriarchs also, Sarah, Rebecca, Rachel, were barren, which was counted a disgrace among the ancients. Not that their barrenness was the effect of sin, since all were just and virtuous, but ordained rather for your benefit, that when you saw a virgin giving birth to the Lord, you might not be faithless, or perplexing your mind with respect to the womb of the barren.”