The Mosaic laws are really quite interesting. These verses can work in tandem with those in Leviticus 19. There later is the understanding of why we were given the Mosaic laws, just for Jesus to disagree with them a bit later, which is explained in Matthew 19:3-8. "

3 Some Pharisees came to him to test him. They asked, “Is it lawful for a man to divorce his wife for any and every reason?”

4 “Haven’t you read,” he replied, “that at the beginning the Creator ‘made them male and female,’ 5 and said, ‘For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh’? 6 So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”

7 “Why then,” they asked, “did Moses command that a man give his wife a certificate of divorce and send her away?”

8 Jesus replied, “Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning."

Many of the things discussed in the Pentateuch (first 5 books of the Bible, where the Mosaic laws lie), are just about how to live their day to day lives, and at the time they had many slaves, something that they wouldn't be willing to change. Instead of this, God commands how to treat these slaves. The Old Testament is full of confusing stuff, but it certainly isn't just from "the Jew section of the Bible" as suggested in another comment. It has value, but they must be understood through a specific lens, understanding the lives of the people God is talking to.