Deuteronomy 12:12
And there rejoice before the LORD your God, you, your sons and daughters, your male and female servants, and the Levites from your towns, who have no allotment or inheritance of their own — the joyful covenant meal includes not merely the family but servants and especially Levites, who have no land inheritance. The law's concern for the marginalized (servants, Levites) is built into central worship.