"So unlike the explanations of Scripture given by the scribes and Pharisees was Christ's teaching, that the attention of the people was arrested. The rabbis dwelt upon tradition, upon human theory and speculation. Often that which men had taught and written about the Scripture was put in place of the Scripture itself. The subject of Christ's teaching was the word of God. He met questioners with a plain, “It is written,” “What saith the Scripture?” “How readest thou?” At every opportunity when an interest was awakened by either friend or foe, He presented the word. With clearness and power He proclaimed the gospel message. His words shed a flood of light on the teachings of patriarchs and prophets, and the Scriptures came to men as a new revelation. Never before had His hearers perceived in the word of God such depth of meaning. MH 21.1"
"He said unto him, What is written in the law? how readest thou?"
EGW directly quotes phrases from the Bible, including "How readest thou?" which is found in Luke 10:26. This is a clear and direct reference.
"But he answered and said unto them, Why do ye also transgress the commandment of God by your tradition?"
Both passages contrast the teachings of Jesus with the traditions of religious leaders. EGW elaborates on how Christ used scripture to counter tradition, which is the core issue in Matthew 15:3.