Albert Barnes Commentary Leviticus 25:38

"I am Jehovah your God, who brought you forth out of the land of Egypt, to give you the land of Canaan, [and] to be your God." — Leviticus 25:38 (ASV)

Here, and in (Leviticus 25:42), (Leviticus 25:55), is expressed the principle which was to limit and modify the servitude of Hebrew servants.