Exodus 19:1-6

In the third month after the children of Israel had left the land of Egypt, the very same day, they came into the Wilderness of Sinai. When they moved out from Rephidim, they came to the Wilderness of Sinai and they camped there; Israel camped at the base of the mountain [of Sinai]. Moses went up to God [on the mountain], and the LORD called to him from the mountain, saying, “Say this to the house of Jacob and tell the Israelites: ‘You have seen what I did to the Egyptians, and how I carried you on eagles’ wings, and brought you to Myself. Now therefore, if you will in fact obey My voice and keep My covenant (agreement), then you shall be My own special possession and treasure from among all peoples [of the world], for all the earth is Mine; and you shall be to Me a kingdom of priests and a holy nation [set apart for My purpose].’ These are the words that you shall speak to the Israelites.”