'Pair' in the Bible

Elijah left there and located Shaphat's son Elisha, who was plowing, along with a total of twelve pairs of oxen. (He was plowing with the twelfth pair.) As Elijah passed by, he tossed his cloak at Elisha.

So Elisha turned back, took the pair of oxen, sacrificed them, boiled their flesh using the farm implements for fuel, and gave the food to the people with him. Then he got up, followed Elijah, and became his servant.