He saved us because of his mercy, and not because of any good things that we have done. God washed us by the power of the Holy Spirit. He gave us new birth and a fresh beginning.
So let's come near God with pure hearts and a confidence that comes from having faith. Let's keep our hearts pure, our consciences free from evil, and our bodies washed with clean water.
These rules are merely about such things as eating and drinking and ceremonies for washing ourselves. And rules about physical things will last only until the time comes to change them for something better.