'Pairs' in the Bible

Of every clean animal you shall take with you seven pair, the male and his female, and of animals that are not clean, two each the male and his female;

also of the birds of the air, seven pair, the male and the female, to keep the offspring alive on the surface of the earth.

“Your teeth are like a flock of newly shorn ewesWhich have come up from washing,All of which bear twins,And not one among them has lost her young.

“Your teeth are like a flock of ewesWhich have come up from their washing,All of which bear twins,And not one among them has lost her young.

“When he sees a chariot, horsemen in pairs,A train of donkeys and a train of camels,Let him pay attention and listen closely, very closely.”

“Now look! Here comes a troop of riders, horsemen in pairs.”And one said, “Fallen, fallen is Babylon;And all the carved images of her gods are shattered on the ground.”