An uncertain voice (adēlon phōnēn). Old adjective (a privative, dēlos, manifest). In N.T. only here and Luk 11:44. Military trumpet (salpigx) is louder than pipe or harp.
Shall prepare himself (paraskeuasetai). Direct middle future indicative of paraskeuazō, old verb, in N.T. only here, 2Co 9:2.; Act 10:10. From para, skeuē (preparation).