Iliad , XIII 700:⁠—

“And Ajax, the swift son of Oileus, never at all stood apart from the Telamonian Ajax; but as in a fallow field two dark bullocks, possessed of equal spirit, drag the compacted plough, and much sweat breaks out about the roots of their horns, and the well-polished yoke alone divides them, stepping along the furrow, and the plough cuts up the bottom of the soil, so they, joined together, stood very near to each other.”