http://www.ffrf.org/lfif/contra.html
Below are a few contradictions, use the link above to view 30 more.
Should we kill?
Exodus 20:13 “Thou shalt not kill.”
Leviticus 24:17 “And he that killeth any man shall surely be put to death.”
vs.
Exodus 32:27 “Thus sayeth the Lord God of Israel, Put every man his sword by his side, . . . and slay every man his brother, . . . companion, . . . neighbor.”
I Samuel 6:19 " . . . and the people lamented because the Lord had smitten many of the people with a great slaughter."
I Samuel 15:2,3,7,8 “Thus saith the Lord . . . Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ***. . . . And Saul smote the Amalekites . . . and utterly destroyed all the people with the edge of the sword.”
Numbers 15:36 “And all the congregation brought him without the camp, and stoned him with stones, and he died; as the Lord commanded Moses.”
Hosea 13:16 “they shall fall by the sword: their infants shall be dashed in pieces, and their women with children shall be ripped up.”
For a discussion of the defense that the Commandments prohibit only murder, see “Murder, He Wrote”, chapter 27 (Losing Faith In Faith: From Preacher To Atheist).
Should we tell lies?
Exodus 20:16 “Thou shalt not bear false witness.”
Proverbs 12:22 “Lying lips are an abomination to the Lord.”
vs.
I Kings 22:23 “The Lord hath put a lying spirit in the mouth of all these thy prophets, and the Lord hath spoken evil concerning thee.”
II Thessalonians 2:11 “And for this cause God shall send them strong delusion, that they should believe a lie.”
Also, compare Joshua 2:4-6 with James 2:25.
Should we steal?
Exodus 20:15 “Thou shalt not steal.”
Leviticus 19:13 “Thou shalt not defraud thy neighbor, neither rob him.”
vs.
Exodus 3:22 “And ye shall spoil the Egyptians.”
Exodus 12:35-36 “And they spoiled [plundered, NRSV] the Egyptians.”
Luke 19:29-34 “[Jesus] sent two of his disciples, Saying, Go ye into the village . . . ye shall find a colt tied, whereon yet never man sat: loose him, and bring him hither. And if any man ask you, Why do ye loose him? thus shall ye say unto him, Because the Lord hath need of him. . . . And as they were loosing the colt, the owners thereof said unto them, Why loose ye the colt? And they said, The Lord hath need of him.”
I was taught as a child that when you take something without asking for it, that is stealing.