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.

Wesley's Notes

133:2 Ointment - It is no less grateful and refreshing than that oil which was poured forth upon Aaron's head at the time of his consecration to the priestly office. Skirts - Not to the lower skirt or bottom of his sacerdotal garment, but to the upper skirt of it, or the mouth of it, as the Hebrew word properly signifies.

Matthew Henry's Concise Commentary

133:1-3 The excellency of brotherly love. - We cannot say too much, it were well if enough could be said, to persuade people to live together in peace. It is good for us, for our honour and comfort; and brings constant delight to those who live in unity. The pleasantness of this is likened to the holy anointing oil. This is the fruit of the Spirit, the proof of our union with Christ, and adorns his gospel. It is profitable as well as pleasing; it brings blessings numerous as the drops of dew. It cools the scorching heat of men's passions, as the dews cool the air and refresh the earth. It moistens the heart, and makes it fit to receive the good seed of the word, and to make it fruitful. See the proof of the excellency of brotherly love: where brethren dwell together in unity, the Lord commands the blessing. God commands the blessing; man can but beg a blessing. Believers that live in love and peace, shall have the God of love and peace with them now, and they shall shortly be with him for ever, in the world of endless love and peace. May all who love the Lord forbear and forgive one another, as God, for Christ's sake, hath forgiven them.