κοπιῶντες [3 verses' (part pl pres act masc nom) "Ye that labour" is kopiao, which means "to be tired," "grow weary," "to be tired," "grow weary," "work hard," "toil," "strive," "struggle," "come to rest," and "arrive at a state of saturation."  The negative form of a verb can mean "to rest from toil." -- "Labour" is from a Greek verb that means "to be tired," "to grow weary," "to work hard," and "to toil."