Deuteronomy 14:29; Deuteronomy 16:11; Isaiah 1:17

29 so that the Levites (who have no allotment or inheritance of their own) and the foreigners, the fatherless and the widows who live in your towns may come and eat and be satisfied, and so that the LORD your God may bless you in all the work of your hands.
11 And rejoice before the LORD your God at the place he will choose as a dwelling for his Name—you, your sons and daughters, your male and female servants, the Levites in your towns, and the foreigners, the fatherless and the widows living among you.
17 Learn to do right; seek justice. Defend the oppressed.Take up the cause of the fatherless; plead the case of the widow.