(Painting by Nicolas Roerich)At the end of Kali Yuga, when there exist no topics on the subject of God, even at the residences of so-called saints and respectable gentlemen, and when the power of
government is transferred to the hands of ministers elected from the evil men, and when nothing is known of the techniques of sacrifice, even by word, at that time the Lord will appear as the supreme chastiser.
—Bhagavata Purana, 2.7.38
The ascetic prince Lord Kalki, the Lord of the universe, will mount His swift white horse Devadatta and, sword in hand, travel over the earth exhibiting His eight mystic opulences and eight special qualities of Godhead. Displaying His unequaled effulgence and riding with great speed, He will kill by the millions those thieves who have dared dress as kings.—Bhagavata Purana, 12.2.19-20
In Hinduism, Kalki (Devanagari: कल्कि; meaning 'Eternity,' 'White Horse,' or 'Destroyer of Filth') is the final incarnation of Vishnu in the current Mahayuga, foretold to appear at the end of Kali Yuga, the current epoch. Religious texts called the Puranas foretell that Kalki will be atop a white horse with a drawn blazing sword. He is the harbinger of end time in Hindu eschatology, after which he will usher in Satya Yuga.