כְּשָׂכִ֥יר כְּתוֹשָׁ֖ב יִהְיֶ֣ה עִמָּ֑ךְ עַד־שְׁנַ֥ת הַיֹּבֵ֖ל יַעֲבֹ֥ד עִמָּֽךְ׃
As a hired servant, and as a settler, he shall be with thee; he shall serve with thee unto the year of jubilee.
Read kabbalistic (mystical) interpretation of Leviticus 25:40: and classical mystical sources.