Mbh 13.28.1b

After a time measured by multiplying the period last named by two hundred, one becomes born in the race of such a Brahmana as lives by the profession of arms. There, in that order, one has to wander for a long period. After a time measured by multiplying the period last named by three hundred, one takes birth in the race of a Brahmana that is given to the recitation of the Gayatri and other sacred Mantras. There, in that order, one has to wander for a long period. After a time measured by multiplying the period last named by four hundred, one takes birth in the race of such a Brahmana as is conversant with the entire Vedas and the scriptures. There, in that order, one has to wander for a very long period. While wandering in that status of existence, joy and grief, desire and aversion, vanity and evil speech, seek to enter into him and make a wretch of him. If he succeeds in subjugating those foes, he then attains a high end. If, on the other hand, those enemies succeed in subjugating him, he falls down from that high status like a person falling down on the ground from the high top of a palmyra tree. Knowing this for certain, O Matanga, I say unto thee, do thou name some other boon, for the status of a Brahmana is incapable of being attained by thee (that hast been born as a Chandala)!'"'"