'Pairs' in the Bible

You are to take with you seven pairs of every clean animal, a male and its mate, and two of the unclean animals, a male and its mate;

along with seven pairs of the flying birds, male and female, in order to keep their offspring alive on the surface of all the earth.

So Samson went out, caught 300 foxes, grabbed some torches, tied the foxes together in pairs at their tails, and fastened a torch between each pair of tails.

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.

Each guard corresponding to each guard, on the east six descendants of Levi were assigned for each day, on the north four for each day, on the south four for each day (as well as two pairs of guards assigned to the storehouse),

except that they each had four faces, four pairs of wings,

Now as to their four faces and four pairs of wings, their pairs of wings overlapped each other. They moved in straight directions without turning their faces around as they moved.