The Geneva Bible Translation Notes, [1599], at sacred-texts.com
(a) Because the greatest part was against David, though some favoured him, yet when he was established king at length, they joined all together like brothers: and therefore he shows by these similarities the convenience of brotherly love.
[It is] like the precious (b) ointment upon the head, that ran down upon the beard, [even] Aaron's beard: that went down to the skirts of his garments;
(b) The ointment was a figure of the graces which come from Christ the head of his Church.
As the dew of (c) Hermon, [and as the dew] that descended upon the mountains of Zion: for (d) there the LORD commanded the blessing, [even] life for evermore.
(c) By Hermon and Zion he means the plentiful country about Jerusalem.
(d) Where there is such concord.