Arcana Coelestia #8829
8829. 'And Jehovah said to Moses' means admonition from the Divine. This is clear from the meaning of 'saying', which includes what follows it, namely the words admonishing them not to break through the bounds with which the mountain was hedged around.
Exodus 19:5
5
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;