14:4 virgins. These will all apparently be young Israelite men, not yet married and having maintained their sexual purity throughout their young lives. They will have been specially chosen and prepared by God for this special ministry, presumably being raised in Orthodox Jewish homes, with deep respect for the Old Testament Scriptures, especially the Mosaic laws. Somehow, after the rapture of all believers shortly before the tribulation begins, they will have been led to recognize Jesus as their Messiah and Savior, resolving to dedicate their whole lives to Him at all costs. It will then be that God will have them sealed for their future service (Revelation 7:3).
14:4 firstfruits. These will be the “firstfruits” of the future Israel. At the end of the tribulation, no doubt in large measure through their witness, “all Israel shall be saved” (Romans 11:26; see also Zechariah 12:10).