““words ‘ebed and doulos has been undertaken with particular attention to their meaning in each specific context. Thus in Old Testament times, one might enter slavery either voluntarily (e.g., to escape poverty or to pay off a debt) or involuntarily (e.g., by birth, by being captured in battle, or by judicial sentence). Protection for all in servitude in ancient Israel was provided by the Mosaic Law. In New Testament times, a doulos is often best described as a “bondservant”—that is, as someone bound to serve his master for a specific (usually lengthy) period of time, but also as someone who might nevertheless own property, achieve social advancement, and even be released or purchase his freedom. The ESV usage””
