Jn 6:53-54, Col 2:12, Rom 6:3-4
In the Old Testament, God had the Israelites eat unleavened bread on the Feast of Unleavened Bread. (Lev 23:6)
Lev 23:6 And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord: seven days ye must eat unleavened bread.
The unleavened bread eaten on the Feast of Unleavened Bread represents the flesh and blood of Jesus. We are to eat the flesh and blood of Christ daily. That is, we must come to know Christ every day. (John 6:53-54, 2 Peter 3:18)
John 6:53 Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. 54 Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
2 Peter 3:18 But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.
The Feast of Unleavened Bread means that we died with Christ and lived together. (Col 2:12, Romans 6:3-4)
Col 2:12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
Romans 6:3 Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? 4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.