On occasions of festivity to be on the left hand
Books:
THE TAO AND ITS CHARACTERISTICS
On occasions of festivity to be on the left hand is the prized
position; on occasions of mourning, the right hand The second in
command of the army has his place on the left; the general commanding
in chief has his on the right;--his place, that is, is assigned to him
as in the rites of mourning He who has killed multitudes of men
should weep for them with the bitterest grief; and the victor in
battle has his place (rightly) according to those rites