Anushasana Parva 60.10

One should go of his own accord to those foremost of Brahmanas who do not solicit any body and make gifts to them of various kinds of wealth in abundance. The merit that comes from properly pouring libations on the sacred fire every morning and evening, is acquired by are the person who makes gifts to a Brahmana endowed with learning, with the Vedas, and with high and excellent vows.