From the early Church Fathers to now.
“And I believe he hath therefore made you come to me, that this maid might be married to one of her own kindred, according to the law of Moses: and now doubt not but I will give her to thee.”
“Moses. It was not so much in force during the captivity, particularly as Raguel had only moveables; and therefore the seven former husbands had not been near relations. (Menochius) — It was a disgrace to refuse marrying a relation, who was an heiress, Numbers xxxvi. 6., and Ruth iv. 6. (Calmet)”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.