Charles Ellicott Commentary Leviticus 26:39

"And they that are left of you shall pine away in their iniquity in your enemies` lands; and also in the iniquities of their fathers shall they pine away with them." — Leviticus 26:39 (ASV)

And those of you who are left will pine away in their iniquity. —Better, But those of you who remain will pine away because of their iniquity; that is, those who will survive the terrible doom described under the five warnings will pine away with grief, reflecting upon their sins that have brought these tribulations upon them.

And also in the iniquities of their fathers they will pine away with them. —Better, and also on account of the iniquity of their fathers with them they will pine away; that is, they will pine away on account of their ancestral sins, which they repeat and reproduce. Hence the ancient Chaldee Versions render it, “And also on account of the evil sins of their fathers, which they hold fast in their hands, they will pine away.” It may, however, also be rendered, “And also on account of the iniquities of their fathers that are with them;” that is, which they must bear and expiate. (See Exodus 20:5.)