'Pairs' in the Bible

So he departed from there and found Elisha the son of Shaphat, while he was plowing with twelve pairs of oxen before him, and he with the twelfth. And Elijah passed over to him and threw his mantle on him.

“When he sees riders, horsemen in pairs,A train of donkeys, a train of camels,Let him pay close attention, very close attention.”

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

And He *summoned the twelve and began to send them out in pairs, and gave them authority over the unclean spirits;