Σινᾶ

Acts 7:30 Σινᾶ Sinai

After forty years had passed, an angel appeared to Moses in the flames of a burning bush in the desert near Mount Sinai.

Here: Exodus 3:1 names the place "Horeb." Stephen, like Josephus, uses the more familiar name Sinai, which treats the two as the same mountain and links the bush to the later giving of the Law (7:38).

Acts 7:38 Σινᾶ Sinai

He was in the assembly in the wilderness with the angel who spoke to him on Mount Sinai, and with our fathers. And he received living words to pass on to us.

Here: Sinai, a name that does not change its ending in Greek. Stephen has already placed the burning bush 'in the wilderness of Mount Sinai' (v. 30), so the same place frames Moses' call and the giving of the Law.

Galatians 4:24 Σινᾶ Sinai

These things serve as illustrations, for the women represent two covenants. One covenant is from Mount Sinai and bears children into slavery: This is Hagar.

Here: For any Jew the name meant the Torah and Israel's founding covenant. Paul links Hagar, an Egyptian slave, to the mountain that stood for Israel's identity, which made the link deliberately jarring.

Galatians 4:25 Σινᾶ Sinai

Now Hagar stands for Mount Sinai in Arabia and corresponds to the present-day Jerusalem, because she is in slavery with her children.

Here: The mountain where the Law was given to Israel through Moses. Here it stands for the Law-covenant itself.