Exodus 19:18
And mount Sinai was altogether on a smoke, because the LORD descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.
God began to speak to his people. He began to declare his Holy Law. His standard of righteousness. Had they accepted his ways, they undoubtedly would have continued to this day. (Things would have been altogether different, their continuing would have kept them in His presence for all eternity, their is a remnant still)
Exodus 19:5,6
5 Now therefore, if ye will obey my voice indeed, and keep my covenant, then ye shall be a peculiar treasure unto me above all people: for all the earth is mine: 6 And ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel.
The Lord is still speaking to his people today, asking them to obey, giving them the option of a greater inheritance.
Romans 5:17
For if by the one man’s offense death reigned through the one, much more those who receive abundance of grace and of the gift of righteousness will reign in life through the One, Jesus Christ.)