Mark 7:2

“And when they saw some of his disciples, etc..] An opportunity soon offered of giving them an handle against him: for observing some of his disciples to sit down to meat, they took notice that they eat bread with defiled (that is to say, with unwashen) hands, and they found fault; with them, and charged them with the breach of the traditions of the elders, and took an occasion from hence of quarrelling with Christ. The Jews use the same phrase the evangelist here does, and interpret it in just the same manner: so, speaking of things eaten, twbawm ydyb, “with defiled hands”; that is, says the commentator f129, it is all one as if it was said, ydy tlyjn alb, “without washing of hands”; which…”

“See this passage explained in the notes at Matthew 15:1-20. Mark 7:1 Came from Jerusalem - Probably to observe his conduct, and to find matter of accusation against him. Mark 7:2 Defiled hands - The hands were considered defiled or polluted unless they were washed previous to every meal. Mark 7:3 Except they wash their hands oft - Our word “oft” means frequently, often. The Greek wore translated oft has been rendered various ways. Some have said that it means “up to the wrist” - unless they wash their hands up to the wrist. Others have said up to the elbow.” There is evidence that the Pharisees had some such foolish rule as this about washing, and it is likely that they practiced it…”

“7:2-4 Mark explains the Pharisaic practices of ritual cleansing for his non-Jewish (Gentile) readers. The ancient traditions (literally the traditions of the elders) were as yet unwritten accounts that the Pharisees believed had been given to Moses on Mount Sinai along with the written law. They were written down around AD 200 in the Mishnah, one of the key sources for understanding ancient Judaism.”

“defiled: or, common, Act 10:14, Act 10:15, Act 10:28 they found: Dan 6:4, Dan 6:5; Mat 7:3-5, Mat 23:23-25 Mark 7:3”