From the last line of the poem "Night Mooring at Maple Bridge" written by Zhang Ji of the Tang Dynasty, "The midnight bell rings to the passenger ship."
Original poem:
Night Mooring at Fengqiao [Tang Dynasty] Zhang Ji
The moon is setting and the sky is full of crows and frost,
Jiangfeng fishing fire To worry about sleep.
Hanshan Temple outside Gusu City,
The midnight bell rang to the passenger ship.