Notice what the Lord tells Pharaoh: Let my people go, so that they may worship me. He didn’t tell Pharaoh to let them go so they’d complain less or so they’d get a few extra days of rest; the purpose was to worship. To worship means to credit worth to something. God doesn’t need us to worship Him, but He does desire it. He desires it because when our eyes are focused on Him, we can’t help but be transformed into His likeness.