G4738 — stethos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
stethos — pronounced stay'-thos
from 2476 (as standing prominently); the (entire external) bosom, i.e. chest:--breast. see GREEK for 2476
5 occurrences in the KJV.
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.
Luke 23:48
And all the people that came together to that sight, beholding the things which were done, smote their breasts, and returned.
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?
Revelation 15:6
And the seven angels came out of the temple, having the seven plagues, clothed in pure and white linen, and having their breasts girded with golden girdles.