Vishnu / Agni / Padma Purana Reference

The Vishnu Purana (Book Four, Chapter 24) also explains that, "When the practices taught in the Vedas and institutes of law have nearly ceased, and the close of the Kali age shall be nigh, a portion of that divine being who exists of His own spiritual nature, and who is the beginning and end, and who comprehends all things, shall descend upon earth. He will be born in the family of Vishnuyasha, an eminent brahmana of Shambhala village, as Kalki, endowed with eight superhuman faculties."

The Agni Purana (16.7-9) also explains that when the non-Aryans who pose as kings begin devouring men who appear righteous and feed on human beings, Kalki, as the son of Vishnuyasha, and Yajnavalkya as His priest and teacher, will destroy these non-Aryans with His weapons. He will establish moral law in the form of the fourfold varnas, or the suitable organization of society in four classes. After that people will return to the path of righteousness.

The Padma Purana (6.71.279-282) relates that Lord Kalki will end the age of Kali and will kill all the wicked mlecchas and, thus, destroy the bad condition of the world. He will gather all of the distinguished brahmanas and will propound the highest truth. He will know all the ways of life that have perished and will remove the prolonged hunger of the genuine brahmanas and the pious. He will be the only ruler of the world that cannot be controlled, and will be the banner of victory and adorable to the world.