C. F. Keil and Franz Delitzsch on Judges 14:18

Jdg 14:18

Thus on the seventh day, before the sun went down (חרסה = חרס, Jdg 8:13; Job 9:7, with a toneless ah, a softening down of the feminine termination: see Ewald, §173, h.), the men of the city (i.e., the thirty young men who had been invited) said to Samson, “What is sweeter than honey, and what stronger than a lion?” But Samson saw through the whole thing, and replied, “If ye had not ploughed with my heifer, ye had not hit upon (guessed) my riddle,”-a proverbial saying, the meaning of which is perfectly clear.