Hymn Lyrics Search - Name That Hymn

There is a very popular hymn that I've sang countless times over the years which has as one of the key lines something about the power of God and Christ to vanquish Satan with just a word, or something to that effect.

Anyone have any ideas? It's got to be one of 50 most popular hymns of all time, since I've sang it countless times...I just can't remember it now...

from "A Mighty Fortress is Our God":

"The Prince of darkness grim, we tremble not for him;

His rage we can endure, for lo his doom is sure.

One little word shall fell him."