'Twelve' in the Bible
These individuals were the ones whom Moses and Aaron registered from the twelve leaders of Israel, each person from his ancestral house.
They brought their offering into the LORD's presence, consisting of six covered carts and twelve oxen one cart each from two leaders and an ox from each one. After they presented them in front of the tent,
This was what was presented at the dedication of the altar from the leaders of Israel on the same day that it was anointed: twelve silver bowls, twelve silver basins, twelve gold ladles.
Also, twelve gold ladles filled with incense were presented, each ladle weighing ten shekels (calculated according to the shekel of the sanctuary). All of the gold of the ladles weighed 120 shekels.
All the livestock for burnt offerings totaled twelve bulls, twelve rams, twelve sheep in their first year with corresponding meal offerings, and twelve male goats for sin offerings.
"Tell the Israelis to take a rod one from each ancestral house, that is, one from every leader, for a total of twelve rods. Write each tribal name on his rod.
So Moses spoke to the Israelis, and each of the tribe leaders gave him a rod, one for each leader, according to their ancestral tribes, for a total of twelve rods. Aaron's rod was one of them.
"On the second day, you are to present twelve young bulls, two rams, and fourteen one year old lambs, all without defects,
They traveled from Marah and arrived at Elim. In Elim there were twelve wells of water and 70 palm trees, so they rested there.