Schaff's Bible Dictionary
RIGHT HAND. Ps 21:8. " Ex 15:6; Ps 77:10. The right hand commonly denotes the south, as the left hand denotes the north. Gen 14:15. It is said to have been the custom among the Jews to swear by the right hand, and that this is implied in Isa 62:8. It was certainly common to swear by the hand. Gen 14:22; Deut 32:40. To give the right hand was a mark of friendship. Gal 2:9. " The right hand being a most useful member of the body, especially to laboring-men, to cut it off implies the greatest sacrifice. Matt 5:30.
To be seated at the right hand is a token of peculiar honor, 1 Kgs 2:19; and when the expression is used respecting Christ, Acts 7:55, it implies his unequalled dignity and exaltation.