Here Peter calls the law of Moses a yoke of bondage, an unbearable yoke. No one could bear it. Over hundreds of years of trying to keep this law of Moses, they could not do it and it was horribly burdensome. Again, go back to Matthew 23 and all the things that Jesus told the Pharisees about pushing the law of Moses onto the people, and they would not lift their finger to lift one of the burdens that they were putting on them.