Srimad Bhagavatam Canto 03, Chapter 12, Text 43

SB 3.12.43

vaikhanasa valakhilyau-
 dumbarah phenapa vane
nyase kuticakah purvam
 bahvodo hamsa-niskriyau
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The four divisions of retired life are the vaikhanasas, valakhilyas, audumbaras and phenapas. The four divisions of the renounced order of life are the kuticakas, bahvodas, hamsas and niskriyas. All these were manifested from Brahma.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The varnasrama-dharma, or the institution of the four divisions and orders of social and spiritual life, is not a new invention of the modern age, as proposed by the less intelligent. It is an institution established by Brahma from the beginning of the creation. This is also confirmed in the Bhagavad-gita (4.13): catur-varnyam maya srstam.
Srimad Bhagavatam Canto 03, Chapter 12, Text 42
Srimad Bhagavatam Canto 03, Chapter 12, Text 44