One called to another and said,
“Holy, holy, holy, is Yahweh of Armies!
The whole earth is full of his glory!” Bible

“Holy, holy, holy.” This triple repetition of “holy” is used by some people as evidence for the doctrine of the Trinity, but that is not the case. It is simply a triple repetition for emphasis, as is found in a few other places in the Bible (Jer. 22:29; Rev. 8:13; cp. 2 Sam. 18:33).

Commentary for: Isaiah 6:3