The Iliad 21.214–221

for ever do the very gods give thee aid. If so be the son of Cronos hath granted thee to slay all the men of Troy, forth out of my stream at least do thou drive them, and work thy direful work on the plain. Lo, full are my lovely streams with dead men, nor can I anywise avail to pour my waters forth into the bright sea, being choked with dead, while thou ever slayest ruthlessly. Nay, come, let be; amazement holds me, thou leader of hosts.