Commentaries:
Jacob lived long before God gave the Ten Commandments at Sinai, yet he understood theft. Stealing is taking or appropriating another's property or ideas without permission, dishonestly or unlawfully, usually in a secret manner. The apostle Paul reiterates the eighth commandment in the New Testament (Romans 13:9), showing that it is clearly a sin to steal.
Martin G. Collins
The Eighth Commandment