Charles H. Spurgeon on Psalms 132:17

The horn of David. This image of a horn is frequent in the Old Testament...The explanation must be found neither in the horns of the altar on which criminals sought to lay hold, nor in the horns with which they ornamented their helmets; the figure is taken from the horns of the bull, in which the power of this animal resides. It is a natural image among an agricultural people...Just as the strength of the animal is concentrated in its horn, so all the delivering power granted to the family of David for the advantage of the people will be concentrated in the Messiah. —F. Godet, in "A Commentary on the Gospel of St. Luke," 1875.