Leviticus 19:32-36
19:32 You must stand up in the presence of the aged, honor the presence of an elder, and fear your God. I am the Lord.
19:33 When a foreigner resides with you in your land, you must not oppress him.
19:34 The foreigner who resides with you must be to you like a native citizen among you; so you must love him as yourself, because you were foreigners in the land of Egypt. I am the Lord your God.
19:35 You must not do injustice in the regulation of measures, whether of length, weight, or volume.
19:36 You must have honest balances, honest weights, an honest ephah, and an honest hin. I am the Lord your God who brought you out from the land of Egypt.