Exodus 24:4
And Moses wrote all the words of the LORD, and rose up early in the morning, and built an altar under the hill, and twelve pillars, according to the twelve tribes of Israel.
Torrey's Topical Textbook—AKJV

Joshua 4:20,24
And those twelve stones, which they took out of Jordan, did Joshua pitch in Gilgal.
Torrey's Topical Textbook—AKJV