Mahabharata 12.60.52

12.60.52

tasmādyaṣṭavyamityāhuḥ puruṣeṇānasūyatā |
śraddhāpavitramāśritya yathāśakti prayacchatā || 52 ||

With regard to homas again, that variety which is called skanna is the initial one, while that which is called askanna is the last (but foremost in point of merit). Sacrifices are multifarious. Their rites and fruits again are multifarious. The Brahmana possessed of devotion who, endued with scriptural learning, who is acquainted with them all, is competent to perform sacrifices. That person who desires to perform a sacrifice is regarded as righteous even if he happens to be a thief, a sinner, or the worst of sinners. The Rishis applaud such a man. Without doubt they are right. This then is the conclusion that all the orders should always and by every means in their power perform sacrifices. There is nothing in the three worlds equal to sacrifice. Therefore, it has been said that every one with heart free from malice, should perform sacrifices, aided by devotion which is sacred, to the best of his power and according as he pleases.'"