Exodus 19:4

In the third month after the children of Israel had gone out of the land of Egypt, on that same day they came into the wilderness of Sinai.

When they had departed from Rephidim, and had come to the wilderness of Sinai, they encamped in the wilderness; and there Israel encamped before the mountain.

Moses went up to God, and the LORD called to him out of the mountain, saying, “This is what you shall tell the house of Jacob, and tell the children of Israel:

Now therefore, if you will indeed obey my voice and keep my covenant, then you shall be my own possession from among all peoples; for all the earth is mine;

and you shall be to me a kingdom of priests and a holy nation.’ These are the words which you shall speak to the children of Israel.”

Moses came and called for the elders of the people, and set before them all these words which the LORD commanded him.