Mahabharata Anushasna Parva Chapter 18:7

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 18:7 All this that I have mentioned is grosser than that which the wise think of with the aid of Penances. Indeed, that subtile Brahma is the cause of life. I bow my head in reverence to it. Let that immutable and indestructible Master, always adored by us, grant us desirable boons. That person who, subjugating his senses and purifying himself, recites this hymn, without interruption in respect of his vow, for one month, succeeds in obtaining the merit that is attached to a Horse-sacrifice. By reciting this hymn the Brahmana succeeds in acquiring all the Vedas; the Kshatriya becomes crowned with victory, O son of Pritha; the Vaisya becomes successful in obtaining wealth and cleverness; and the Sudra, in winning happiness here and a good end hereafter. Persons of great fame, by reciting this prince of hymns that is competent to cleanse every sin and that is highly sacred and purifying, set their hearts on Rudra. A man by reciting this prince of hymns succeeds in living in heaven for as many years as there are pores in his body.