Daharasutta

sn3.1:8.1 With its rainbow of colors,

sn3.1:8.2 the serpent of fiery breath glides along.

sn3.1:8.3 It lashes out and bites the fool,

sn3.1:8.4 both men and women alike.

sn3.1:8.5 Hence you should avoid it

sn3.1:8.6 for the sake of your own life.