Deuteronomy 17:6

17:6 At the testimony of two or three witnesses they must be executed. They cannot be put to death on the testimony of only one witness.

Deuteronomy 20:18

20:18 so that they cannot teach you all the abhorrent ways they worship their gods, causing you to sin against the Lord your God.

Deuteronomy 28:27

28:27 The Lord will afflict you with the boils of Egypt and with tumors, eczema, and scabies, all of which cannot be healed.