You Fools !
Expecting commandment of men to be followed rather than the commandment God (Love of God)

Not just preaching of the commandments of men (Cultural based), but the preachers expected others to follow them more religiously than the commandments of God, and Keeping outwardly things clean is one of the commandments of men,   - While Jesus was speaking, a Pharisee asked him to dine with him, so he went in and reclined at table. The Pharisee was astonished to see that he did not first wash before dinner - Luke 11:37-42

But Jesus Christ came to this world to fulfill God's Commandment, and to keep our inwardly things clean - And the Lord said to him, Now you Pharisees cleanse the outside of the cup and of the dish, but inside you are full of greed and wickedness. You fools! Did not he who made the outside make the inside also? But give as alms those things that are within, and behold, everything is clean for you. But woe to you Pharisees! For you tithe mint and rue and every herb, and neglect justice and the love of God. These you ought to have done, without neglecting the others - Luke 11:37-42

Don't be like Fools!

Preach about the commandment God, Only Love of God can produce good fruit.