Bread Explanation
Apostle John who was with Christ until his last moment of the crucifixion, has revealed that Jesus Christ is not the image of Word alone, but the Image of Father, Word and the Holy Spirit, and we must believe in him to overcome this world - 5.Who is it that overcomes the world? Only the one who believes that Jesus is the Son of God. 6.This is the one who came by water and blood—Jesus Christ. He did not come by water only, but by water and blood. And it is the Spirit who testifies, because the Spirit is the truth - 1 John 5:5-6
To understand this in a better way, apostle John first explaining the Trinity of our Heavenly Father as Father, Word and Holy Spirit - because there are three who are testifying in Heaven: the Father, the Word, and the Holy Spirit, and these three are one - 1 John 5:7
And then he explained about the Son Jesus Christ, that Jesus had all three of them(Father, Son, and the Holy Spirit) in him - and there are three who are testifying in the earth: the Spirit(Holy Spirit), and the water(Word), and the blood(Father) and the three are into the one(Jesus Christ) - 1 John 5:8
That was the reason Apostle Paul is saying that Jesus Christ is the Image of the invisible God - The Son is the image of the invisible God, the firstborn over all creation - Colossians 1:15 that means in Jesus Christ we can see the Son (The Word became flesh - John 1:14), and our Heavenly Father (Whoever has seen me has seen the Father - John 14:9), and the Holy Spirit (The Spirit of the Lord is upon me - Luke 4:18).
Bread Explanation
When God visited Abraham as a three person(Trinity God), and Abraham invited them to have a bread - 1.And the Lord appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day; 2.And he lift up his eyes and looked, and, lo, three men stood by him: and when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground, 3.And said, My Lord, if now I have found favour in thy sight, pass not away, I pray thee, from thy servant: 4.Let a little water, I pray you, be fetched, and wash your feet, and rest yourselves under the tree: 5.And I will fetch a morsel of bread, and comfort ye your hearts; after that ye shall pass on: for therefore are ye come to your servant. And they said, So do, as thou hast said - Genesis 18:1-5
Then Abraham asked Sarah to make a bread from three measures of fine meal, this is to tell that the Bread will be the son of Trinity God(Father, Word, and Holy Spirit) - 6.So Abraham hurried into the tent to Sarah. Quick, he said, get three seahs of the finest flour and knead it and bake some bread. 7.Then he ran to the herd and selected a choice, tender calf and gave it to a servant, who hurried to prepare it - Genesis 18:6-7
But the Abraham, who invited God to have a Bread, instead of Bread he served three other items that is butter, milk. So, in Abraham's language Bread means Calf, Butter and Milk, that is the Son of God, the image of the Trinity God - And he took butter, and milk, and the calf which he had dressed, and set it before them; and he stood by them under the tree, and they did eat - Genesis 18:8
Here the Calf is representing the Word(The Word became flesh - John 1:14), and the butter, and milk are representing the Father and the Holy Spirit, Actually the butter and milk belongs to the Calf, the Cow produced it for her Calf, and not for Humans, but it was also served with the Calf, and the same thing happened at the Cross, when the Christ was crucified for our salvation, the Father and Holy Spirit also broken for us receive the Mercy and Power - 13.When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come. 14.He will glorify me, for he will take what is mine and declare it to you. 15.All that the Father has is mine; therefore I said that he will take what is mine and declare it to you - John 16:13-15