A case can be made that there are two Yahwehs in Exodus 19:
‘And said Yahweh to Moses to go to the people and consecrate them today and tomorrow and let them wash their clothes and let them be ready for the third day for on the third day will come down Yahweh in the sight of all the people upon Mount Sinai. And you shall set bounds for the people all around saying take heed to yourselves that you do not go up to the mountain or touch its base. Whoever touches the mountain surely shall be put to death. Not shall touch him a hand, but surely, he shall be stoned or shot with an arrow. Whether beast or man, not he shall live. When the trumpet sounds long, they shall come near the mountain.
So, Moses went down from the mountain to the people and sanctified the people and they washed their clothes. And he said to the people be ready. For three day not to come near your wives. And it came to pass on the third day in the morning that there were ‘thunderings’ and ‘lightnings’ and a cloud thick on the mountain and the sound of the trumpet was very mighty so that all the people who were in the camp trembled. And brought Moses the people to meet with God out of the camp and they stood at the foot of the mountain.’
And Mount Sinai was completely in smoke because Yahweh descended upon it in fire and ascended its smoke like the smoke of a furnace and the whole mountain quaked greatly. And when the blast of the trumpet sounded long and became very strong, Moses spoke, and the God answered him by voice.
And came down Yahweh upon Mount Sinai on the top of the mountain and called Yahweh Moses to the top of the mountain and went up Moses and said Yahweh to Moses go down and warn the people lest they break through at Yahweh to gaze and perish many of them. And the priests who come near unto Yahweh, let consecrate themselves lest break out against them Yahweh. But said Moses to Yahweh, cannot the people come up to Mount Sinai for You warned us saying set bounds around the mountain and consecrate it. And said to him Yahweh. Away. Get down. Then come up you and Aaron with you, but the priests and the people do not let break through to come up to Yahweh, lest He break out against them. So, went down Moses to the people and spoke to them’.
(Exodus 19:10-25 Bible Hub Interlinear)
In both verse 22 and 24 the one Yahweh calls the other Yahweh ‘Yahweh.’ In Exodus 19:24 the one Yahweh is actively trying to protect the priests and people from the other Yahweh. He warns Moses not to let the priests and people try to go up to the other Yahweh because the other Yahweh might break out against the priests and people.
If one studies earlier passages in Exodus in which Yahweh speaks to Moses there are no instances of Yahweh using illeism. lleism is the act of referring to oneself in the third person instead of the first person. Therefore, it is highly unlikely that Yahweh suddenly starts to use illeism in Exodus 19. The most reasonable explanation for what is happening in Exodus 19 is that there are two Yahwehs present at Mount Sinai and that one of the Yahwehs is the Angel of Yahweh, the Holy Spirit. The other Yahweh, who is not actually seen, is Yahweh the Father.
