Then believed they his words; they sang his praise.
Read Chapter 106
Augustine of Hippo
AD 430
10. "Then believed they in His words" (ver. 12). The expression seemeth barely Latin, for he saith not "believed His word," or "on His words," but "in His words;" yet it is very frequent in Scripture. "And praised praise unto Him;" such an expression as when we say, "This servitude he served," "such a life he lived." He is here alluding to that well-known hymn, commencing, "I will sing unto the Lord, for He hath triumphed gloriously: the horse and the rider hath He thrown into the sea."