The adjective ὀξύς appears eight times in the New Testament, almost entirely in Revelation's visions of sharp sickles and double-edged swords. In seven of these, it describes the keen cutting edge of a weapon or harvesting tool — the sharp two-edged sword proceeding from Christ's mouth (Rev 1:16, 2:12) and the sharp sickle of eschatological harvest (Rev 14:14, 17, 18). A single occurrence in Rom 3:15, quoting Isaiah 59:7, pivots to a different sense entirely: 'swift are their feet to shed blood,' where ὀξύς describes rapid movement rather than a blade's edge.