1) A real brahmana never hoards money for a luxurious life, like the ksatriyas or the vaisyas, but always keeps himself poverty-stricken, knowing that money diverts the mind to materialistic ways of life. To live in this way is the vow of a qualified brahmana. (From Krsna Book)

2) The brahmanas should live by spreading knowledge and should therefore take contributions from their disciples. (From SB 4.21.50 ppt.)