“Sōtēria: Salvation in Early Christianity and Antiquity: Festschrift in Honour of Cilliers Breytenbach on the Occasion of His 65th Birthday” (Novum Testamentum, Supplements)
by David Du Toit (Editor), Christine Gerber (Editor), Christiane Zimmermann (Editor)

This important book on ancient salvation in the post-Hellenist world was released in 2019, and is still very expensive to purchase. I was able to get my hands temporarily on a copy through an interlibrary loan and was able to make just a few article .pdfs.