Albert Barnes Commentary Matthew 15:13

"But he answered and said, Every plant which my heavenly Father planted not, shall be rooted up." — Matthew 15:13 (ASV)

Every plant, etc. Religious doctrine is suitably compared to a plant (see 1 Corinthians 3:6–8). It is planted in the mind for the purpose of producing fruit in the life, or conduct.

Jesus here says that all those doctrines of which His Father was not the Author must be rooted up, or corrected.

The false doctrines of the Pharisees, therefore, must be attacked. It was no wonder if they were indignant. It could not be helped; it was His duty to attack them.

He was not surprised that they were enraged. But, notwithstanding their opposition, their doctrines should be destroyed.

See Barnes on Matthew 15:10.