That's baloney! If the Jews Bible is to be belived Judaism is also based on revelation to one man "Moses" who was a reformer. From there the national fiction of a "chosen people" grew though modifications, redactions and prophets who tried to reach the hard headed people.
Bs'd
God spoke the Ten Commandments not to Moses, but to the whole nation of millions of people:
And God spoke all these words, saying:
2 “I am the Lord your God, who brought you out of the land of Egypt, out of the house of bondage.
3 “You shall have no other gods before Me.
4 “You shall not make for yourself a carved image—any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth; 5 you shall not bow down to them nor serve them. For I, the Lord your God, am a jealous God, visiting the iniquity of the fathers upon the children to the third and fourth generations of those who hate Me, 6 but showing mercy to thousands, to those who love Me and keep My commandments.
7 “You shall not take the name of the Lord your God in vain, for the Lord will not hold him guiltless who takes His name in vain.
8 “Remember the Sabbath day, to keep it holy. 9 Six days you shall labor and do all your work, 10 but the seventh day is the Sabbath of the Lord your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. 11 For in six days the Lord made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the Lord blessed the Sabbath day and hallowed it.
12 “Honor your father and your mother, that your days may be long upon the land which the Lord your God is giving you.
13 “You shall not murder.
14 “You shall not commit adultery.
15 “You shall not steal.
16 “You shall not bear false witness against your neighbor.
17 “You shall not covet your neighbor’s house; you shall not covet your neighbor’s wife, nor his male servant, nor his female servant, nor his ox, nor his donkey, nor anything that is your neighbor’s.”
The People Afraid of God’s Presence
18 Now all the people witnessed the thunderings, the lightning flashes, the sound of the trumpet, and the mountain smoking; and when the people saw it, they trembled and stood afar off. 19 Then they said to Moses, “You speak with us, and we will hear; but let not God speak with us, lest we die.”
20 And Moses said to the people, “Do not fear; for God has come to test you, and that His fear may be before you, so that you may not sin.” 21 So the people stood afar off, but Moses drew near the thick darkness where God was.
The Law of the Altar
22 Then the Lord said to Moses, “Thus you shall say to the children of Israel:
‘You have seen that I have talked with you from heaven."
Ex 20
"And Moses called all Israel, and said to them: “Hear, O Israel, the statutes and judgments which I speak in your hearing today, that you may learn them and be careful to observe them. 2 The Lord our God made a covenant with us in Horeb. 3 The Lord did not make this covenant with our fathers, but with us, those who are here today, all of us who are alive. 4 The Lord talked with you face to face on the mountain from the midst of the fire. 5 I stood between the Lord and you at that time, to declare to you the word of the Lord; for you were afraid because of the fire, and you did not go up the mountain. He said:
6 ‘I am the Lord your God who brought you out of the land of Egypt, out of the house of bondage.
7 ‘You shall have no other gods before Me.
8 ‘You shall not make for yourself a carved image—any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth; 9 you shall not bow down to them nor serve them. For I, the Lord your God, am a jealous God, visiting the iniquity of the fathers upon the children to the third and fourth generations of those who hate Me, 10 but showing mercy to thousands, to those who love Me and keep My commandments.
11 ‘You shall not take the name of the Lord your God in vain, for the Lord will not hold him guiltless who takes His name in vain.
12 ‘Observe the Sabbath day, to keep it holy, as the Lord your God commanded you. 13 Six days you shall labor and do all your work, 14 but the seventh day is the Sabbath of the Lord your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your ox, nor your donkey, nor any of your cattle, nor your stranger who is within your gates, that your male servant and your female servant may rest as well as you. 15 And remember that you were a slave in the land of Egypt, and the Lord your God brought you out from there by a mighty hand and by an outstretched arm; therefore the Lord your God commanded you to keep the Sabbath day.
16 ‘Honor your father and your mother, as the Lord your God has commanded you, that your days may be long, and that it may be well with you in the land which the Lord your God is giving you.
17 ‘You shall not murder.
18 ‘You shall not commit adultery.
19 ‘You shall not steal.
20 ‘You shall not bear false witness against your neighbor.
21 ‘You shall not covet your neighbor’s wife; and you shall not desire your neighbor’s house, his field, his male servant, his female servant, his ox, his donkey, or anything that is your neighbor’s.’
22 “These words the Lord spoke to all your assembly, in the mountain from the midst of the fire, the cloud, and the thick darkness, with a loud voice; and He added no more. And He wrote them on two tablets of stone and gave them to me.
23 “So it was, when you heard the voice from the midst of the darkness, while the mountain was burning with fire, that you came near to me, all the heads of your tribes and your elders. 24 And you said:
‘Surely the Lord our God has shown us His glory and His greatness, and we have heard His voice from the midst of the fire. We have seen this day that God speaks with man; yet he still lives. 25 Now therefore, why should we die? For this great fire will consume us; if we hear the voice of the Lord our God anymore, then we shall die. 26
For who is there of all flesh who has heard the voice of the living God speaking from the midst of the fire, as we have, and lived?"
Deut 5