Adam Clarke on Psalms 20:5

We will rejoice in thy salvation - We expect help from thee alone; it is in thy cause we engage; and to thee, as our war is a just one, we consecrate our banners, inscribed with thy name. It is said that the Maccabees had their name from the inscription on their banners; which was taken from Exo 15:11, מי כמכה באלם יהוה mi camochah baelim Yehovah, "Who is like unto thee, O Lord, among the gods?" The word being formed from the initial letters מ M, כ C, ב B, י I, מכבי Ma Ca B I, whence Maccabeus and Maccabees.

The words of this verse were spoken by David and his officers; immediately after which I suppose the high priest to have added, The Lord fulfill all thy petitions!