From the Srimad-Bhagavatam

shambhala-grama-mukhyasya brahmanasya mahatmanah 
bhavane vishnuyashasah kalkih pradurbhavishyati

“Lord Kalki will appear in the home of the most eminent brahmana of Shambhala village, the great soul Vishnuyasha.”

ashvam ashu-gam aruhya devadattam jagat-patih 
asinasadhu-damanam ashtaishvarya-gunanvitah

“Lord Kalki, the Lord of the universe, will mount His swift horse Devadatta and, sword in hand, travel over the earth exhibiting His eight mystic opulence’s and eight special qualities of Godhead.

vicarann ashuna kshaunyam hayenapratima-dyutih 
nripa-linga-cchado dasyun kotisho nihanishyati

“Displaying His unequalled effulgence and riding with great speed, He will kill by the millions those thieves who have dared dress as kings.”

atha tesham bhavishyanti manamsi vishadani vai 
vasudevanga-ragati- punya-gandhanila-sprisham
paura-janapadanam vai hatesv akhila-dasyushu

“After all the imposter kings have been killed, the residents of the cities and towns will feel the breezes carrying the most sacred fragrance of the sandalwood paste and other decorations of Lord Kalki, and their minds will thereby become transcendentally pure.”

yadavatirno bhagavan kalkir dharma-patir harih 
kritam bhavishyati tada praja-sutish ca sattviki

“When the Supreme Lord Hari [Krishna] has appeared on earth as Kalki, the maintainer of religion, Satya-yuga [the age of truth] will begin, and human society will bring forth progeny in the mode of goodness.”