In keeping post at the gate, they captured evil spirits, bound them in rushes and fed them to tigers. In honor of their faithful service, people began to draw or hang their images on home entrances.
東北方有鬼門，為萬鬼出沒之處，神荼、鬱壘據門而守，凡遇惡鬼，便以葦索捆綁餵虎，民間於是在門扉畫上二位捉鬼大將以驅邪。