I know a few...
"For six days work may be done, but on the seventh day you shall have a holy day, a sabbath of complete rest to the LORD; whoever does any work on it shall be put to death." Exodus 35:2
"As for your male and female slaves whom you may have-- you may acquire male and female slaves from the pagan nations that are around you." Leviticus 25:44
"If a man sells his daughter as a female slave, she is not to go free as the male slaves do." Exodus 21:7