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OK, how about the doctrine of Mary being a virgin forever? Or the doctrine of praying to "saints"?

You're probably looking for a specific statement, but it doesn't work that way. We take bits and pieces to form a whole. This probably won't satisfy you, but those we celebrate as saints are with God and God works through them. It takes a lot to be canonized, including a miracle which is why we believe them to be saints. There are more citations, but I can't do it right this minute.

Saints:

1 Corinthians 1
2 To (1) the church of God which is at (2) Corinth, to those who have been sanctified in Christ Jesus, saints (3) by calling, with all who in every place (4) call on the name of our Lord Jesus Christ, their Lord and ours:

1 Corinthians 12
12 For even (1) as the body is one and yet has many members, and all the members of the body, though they are many, are one body, (2) so also is Christ.

Ephesians 1
23 which is His (1) body, the (2) fullness of Him who (3) fills (4) all in all.

Ephesians 4
12 (1) for the equipping of the saints for the work of service, to the building up of (2) the body of Christ;

Colossians 1
18 He is also (1) head of (2) the body, the church; and He is (3) the beginning, (4) the firstborn from the dead, so that He Himself will come to have first place in everything.
24 (5) Now I rejoice in my sufferings for your sake, and in my flesh (6) I do my share on behalf of (7) His body, which is the church, in filling up what is lacking in Christ's afflictions.

Colossians 2
19 and not holding fast to (1) the head, from whom (2) the entire body, being supplied and held together by the joints and ligaments, grows with a growth which is from God.

I'll have to do Mary tomorrow. Again, it's not in one spot. Although, she did say herself that she was the handmaid of the Lord.