Charles H. Spurgeon on Psalms 106:28

They joined themselves also unto Baalpeor. The narrative (Nu 25:1-18) seems clearly to show that this form of Baal worship was connected with licentious rites. Without laying too much stress on the Rabbinical derivation of the word rwep, hiatus, i.e., "aperire hymenem virgineum", we seem to have reason to conclude that this was the nature of the worship. Baal Peor was identified by the Rabbins and early fathers with Priapus (see the authorities quoted by Selden, De Diis Syris, 1., 4, p. 302, sq., who, however, dissents from this view.) This is, moreover, the view of Creuzer (2., 411), Winer, Gesenius, Furst, and almost all critics. The reader is referred for more detailed information particularly to Creuzer's Symbolik and Movers' Phönizier. William Gotch, in "Smith's Dictionary of the Bible."