Strong G4738 στῆθος stēthos · chest

Luke

1. 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.
2. Luke 23:48
   And all the people that came together to that sight, beholding the things which were done, smote their breasts, and returned.