Concerning tradition:
2 Thessalonians 2:15: “Stand firm . . .”
[15] So then, brethren, stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter.
1 Corinthians 11:2: “Hold fast”
[2]I commend you because you remember me in everything and maintain the traditions even as I have delivered them to you.
The Church as the foundation:
1 Timothy 3:15: “But if I should be delayed”
[15] if I am delayed, you may know how one ought to behave in the household of God, which is the church of the living God, the pillar and bulwark of the truth.
The Eucharist:
John 6:51-55: “I am the living bread”
[51] I am the living bread which came down from heaven; if any one eats of this bread, he will live for ever; and the bread which I shall give for the life of the world is my flesh.”
[52]The Jews then disputed among themselves, saying, “How can this man give us his flesh to eat?”
[53] So Jesus said to them, “Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you;
[54] he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day.
[55] For my flesh is food indeed, and my blood is drink indeed.