'Breast' in the Bible

But the tax collector, standing at a distance, would not even raise his eyes toward heaven, but was striking his chest [in humility and repentance], saying, ‘God, be merciful and gracious to me, the [especially wicked] sinner [that I am]!’

Then leaning back against Jesus’ chest, he (John) asked Him [privately], “Lord, who is it?”

Peter turned and saw the disciple whom Jesus loved following them; the one who also had leaned back on His chest at the supper and had said, “Lord, who is it that is going to betray You?”

and in the midst of the lampstands I saw someone like the Son of Man, dressed in a robe reaching to His feet, and with a golden sash wrapped around His chest.