Verses with the word breast in the New Testament (3 verses):

Luke 18:13
And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.

John 13:25
He then lying on Jesus' breast saith unto him, Lord, who is it?

John 21:20
Then Peter, turning about, seeth the disciple whom Jesus loved following; which also leaned on his breast at supper, and said, Lord, which is he that betrayeth thee?