Moses was the leader of the descendants of Abraham. He led the people out from Egypt after God sent the ten plagues.

The people came to Mt Sinai. Moses brought the people out to meet God. There was thunder, lighting, a dense cloud and the sound of loud trumpets. All the people were filled with fear.

The Lord had descended upon Mt Sinai in the fire and smoke rose up like the smoke of a furnace. The entire mountain trembled. The sound of the trumpet grew louder and louder. Then God spoke the Ten Commandments to the people, the Jews. Exodus 19-20.

They were entrusted with the words of God. Romans 3. They heard God speak.
There is no other nation who heard God’s voice. God gave revelation to the Jews, the Ten Commandments.