मूत्रश्लेष्माशनः पाप निरयं प्रतिपत्स्यसे
– ओ पापी , तू मूत्र और लार खानेवाला कीडा होकर नरक मे पडेगा ।
This curse was given by Brighu rishi to an asura who kidnapped his wife ( in Satyug ).
In later life , (in dwapar yug ) the asura was born as insect called as ‘अलर्क ‘
This insect than bite karna ( कर्ण ) on his thigh when rishi Parshurama ( परशुराम ) was sleeping on karna ‘s lap.