Albert Barnes Commentary Jeremiah 44:7

"Therefore now thus saith Jehovah, the God of hosts, the God of Israel: Wherefore commit ye [this] great evil against your own souls, to cut off from you man and woman, infant and suckling, out of the midst of Judah, to leave you none remaining;" — Jeremiah 44:7 (ASV)

Your souls - that is, your own selves.