فَلْيَضْحَكُوا قَلِيلًا وَلْيَبْكُوا كَثِيرًا
Let them laugh little and weep much.
“Laugh” is opposed to “weep,” while “little” contrasts with “much.” These two linked pairs form a conspicuous structure of muqābalah. Antithetical elements are present, but naming a single opposite pair does not explain the whole pattern.
For a rigorous account, arrange the terms in two corresponding rows and show how each member is paired with its appropriate contrary.