Chitraketu as Vidyadhara is Cursed

 Srimad Bhagavatam - Chitraketu is Cursed

Why did Goddess Parvathi curse Chitraketu, who became a Vidyadhara?

Lord Vishnu blessed Chitraketu to be a Vidyadhara (demi-gods) chief and offered him a Vimana. Chitraketu, using it, went about flying in the air.

Once, while flying near Mount Kailash, he saw Goddess Parvathi sitting on Shiva's lap with Shiva's arm on Goddess Parvathi's shoulder. In that assembly, there were sages, Siddhas (a class of demigods blessed with mystical powers), and Caranas (celestial bards).

Going near them, Chitraketu laughed loudly and said, " Lord Shiva, who is engaged in expounding righteousness to all, yet actually embracing His consort in open assembly.

Lord Shiva, on hearing these remarks, heartily laughed and remained silent. Goddess Parvati spoke angrily, " Is this fellow the (only) lord now ruling over the world and wielding the rod of punishment and being competent?

Brahma, the sons of Brahma (Bhrgu, Narada, Angira, Sanakas), Lord Kapila, and Swayambu Manu were in the assembly. They knew Prakriti and Purusha could not be separated. She felt Chitraketu deserved to be punished and cursed him to be born as a demon.

Chitraketu, in his next birth, was born as Vritasur and was killed by Indra. The fault of humiliating Lord Shiva and Goddess Parvathi led him to be born as a demon.

Source: Bhagavatha Mahapurana