Thomas, Jesus used spit and mud to show the Pharisees that their oral traditions were wrong- mud and spit were called unclean by them, not God. The Pharisees went beyond God's Word, the Law of Moses, putting restrictions on folks where God had not. You see, in Jesus' day the oral tradition took precedence over the Law of Moses. This was the teaching given to rabbinical students in the Hillel schools for generations before Christ's birth. Everything Jesus did in front of them was to refute their oral traditions and get them back to the Law. And, on another note, when you study the Hebrew words for the oral law, aka, traditions, and the Law, you will know that when Paul said that we are not under the law, he meant the oral law, for righteousness. We are still to keep the Ten Commandments. The Levitical laws have a different Hebrew word than the Ten. If you want to know Scriptures and what the true intent of them are, find an online Messianic Bible Study. And, as with anyone, use discernment.