Easton’s Bible Dictionary
Bosom: In the East objects are carried in the bosom which Europeans carry in the pocket. To have in one's bosom indicates kindness, secrecy, or intimacy (Genesis 16:5; 2 Samuel 12:8). Christ is said to have been in "the bosom of the Father," i.e., he had the most perfect knowledge of the Father, had the closest intimacy with him (John 1:18). (John 13:23) was "leaning on Jesus' bosom" at the last supper. Our Lord carries his lambs in his bosom, i.e., has a tender, watchful care over them (Isaiah 40:11).