Matthew 15:10

And he called to him the multitude, and said unto them, Hear and understand. Not that which entereth into the mouth defileth the man; but that which proceedeth out of the mouth, this defileth the man.

"This he said, making all meats clean" (Mark 7:19). Strangely, people are still trying to get to heaven on some kind of diet! Some won't eat pork; some eat only fish on certain days; and some are actually vegetarians! Novation said, "God is not worshipped by the belly nor by meats. ... He who worships the Lord by meats, is merely as one who has his belly for his Lord."[4] Paul declared every creature of God is to be "good, and not to be rejected, for it is sanctified by the word of God and prayer" (1 Timothy 4:4ff).

Here is also a bold emphasis on the defilement that comes out of a man. These are identified as murders, fornications, thefts, and all crimes conceived in the heart and effected through the use of speech. In the second century, Clement of Alexandria, in admonitions to the heathen, said:

From filthy speaking, we ourselves must entirely abstain, and stop the mouths of those who practice it by stern looks and averting the face ... "For what proceedeth out of the mouth," he says, "defileth a man." - shows him to be unclean, and heathenish, and untrained, and licentious.[5]

[4] Novation, On Jewish Meats in Ibid., Vol. V, p. 648.

[5] Clement of Alexandria, Exhortations to the Heathen in Ibid., Vol. II, p. 250.