'Pairs' in the Bible

You shall take seven pairs of every clean animal with you, the male and his female. Of the animals that are not clean, take two, the male and his female.

went by pairs to Noah into the ship, male and female, as God commanded Noah.

They went to Noah into the ship, by pairs of all flesh with the breath of life in them.

When he sees a troop, horsemen in pairs, a troop of donkeys, a troop of camels, he shall listen diligently with great attentiveness."

Behold, here comes a troop of men, horsemen in pairs." He answered, "Fallen, fallen is Babylon; and all the engraved images of her gods are broken to the ground.