John Trapp on Psalms 110:3

Verſ. 3. Thy people ſhall be willing] All Chriſts ſubjects are Volunteers, free-hearted,In Pſal. 1. like thoſe Iſles that wait for Gods Law, Iſa. 42.8. Zech. 8.11. They love to be his ſervants, Iſa. 56.6. Lex voluntaries quaerit, ſaith Ambroſe.

In the day of thy power] Copiarum tuarum of thine Army, or of thy Militia, when thou ſhalt lead on thy Church Militant, and be in the head of them, conquering and to conquer, Rev. 6.2. Some underſtand it of the Chriſtian Sabbath day.

In the beauties of holineſs] i.e. In Church aſſemblies, in the beauty of holy Ordinances, at the adminiſtration whereof, Chriſts Birth-dew, that is, the influence of his Spitis and his preſence in thoſe Ordinances is from the womb of the morning, i.e. is of that generating and enlivening vertue, that the dew of the teeming morning is to the ſeeds and plants of the earth. An apt ſimilitude both to expreſs the multitude of Chriſt[illegible: 1 letter] converts, and the manner of their heavenly generation. See Mac. 5.7. with the Note.