Deuteronomy 9:15

9:15 So I turned and went down the mountain while it was blazing with fire; the two tablets of the covenant were in my hands.

Exodus 31:18

31:18 He gave Moses two tablets of testimony when he had finished speaking with him on Mount Sinai, tablets of stone written by the finger of God.

Exodus 34:28

34:28 So he was there with the Lord forty days and forty nights; he did not eat bread, and he did not drink water. He wrote on the tablets the words of the covenant, the ten commandments.

Jeremiah 31:31-32

31:31 “Indeed, a time is coming,” says the Lord, “when I will make a new covenant with the people of Israel and Judah. 31:32 It will not be like the old covenant that I made with their ancestors when I delivered them from Egypt. For they violated that covenant, even though I was like a faithful husband to them,” says the Lord.

Galatians 4:24

4:24 These things may be treated as an allegory, for these women represent two covenants. One is from Mount Sinai bearing children for slavery; this is Hagar.