Mt 15:7-9, Mk 7:5-9, Col 2:16-17
In the Old Testament, the Israelites did not follow God's Word with their hearts, but followed them formally. (Isa 29:13, Mt 15:7-9, Mark 7:5-9)
Isa 29:13 Wherefore the Lord said, Forasmuch as this people draw near me with their mouth, and with their lips do honour me, but have removed their heart far from me, and their fear toward me is taught by the precept of men:
Mt 15:7 Ye hypocrites, well did Esaias prophesy of you, saying, 8 This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me. 9 But in vain they do worship me, teaching for doctrines the commandments of men.
Mark 7:5 Then the Pharisees and scribes asked him, Why walk not thy disciples according to the tradition of the elders, but eat bread with unwashen hands? 6 He answered and said unto them, Well hath Esaias prophesied of you hypocrites, as it is written, This people honoureth me with their lips, but their heart is far from me. 7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men. 8 For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do. 9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.
The eating and drinking, feasts, new moons, and the Sabbaths described in the Old Testament are meant to describe Christ. (Col 2:16-17)
Col 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: 17 Which are a shadow of things to come; but the body is of Christ.