At Sāvatthī.

Standing to one side, the god Māgadha addressed the Buddha in verse:

“How many lamps are there 
that light up the world? 
We’ve come to ask the Buddha; 
how are we to understand this?”

“There are four lamps in the world, 
a fifth is not found. 
The sun blazes by day, 
the moon glows at night,

while a fire lights up both 
by day and by night. 
But a Buddha is the best of lights: 
this is the supreme radiance.”