Through all the words of Sacred Scripture, God speaks only one single Word, his one Utterance in whom he expresses himself completely:
You recall that one and the same Word of God extends throughout Scripture, that it is one and the same Utterance that resounds in the mouths of all the sacred writers, since he who was in the beginning God with God has no need of separate syllables; for he is not subject to time.
Source: Catechism of the Catholic Church (Vatican.va)