Deuteronomy 25:13-19

13Thou shalt not have in thy bag divers weights, a great and a small.1 14Thou shalt not have in thine house divers measures, a great and a small.2 15But thou shalt have a perfect and just weight, a perfect and just measure shalt thou have: that thy days may be lengthened in the land which Yhwh thy God giveth thee. 16For all that do such things, and all that do unrighteously, are an abomination unto Yhwh thy God.

17Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt; 18How he met thee by the way, and smote the hindmost of thee, even all that were feeble behind thee, when thou wast faint and weary; and he feared not God. 19Therefore it shall be, when Yhwh thy God hath given thee rest from all thine enemies round about, in the land which Yhwh thy God giveth thee for an inheritance to possess it, that thou shalt blot out the remembrance of Amalek from under heaven; thou shalt not forget it.