Manusmriti
अध्यापनमध्ययनं यजनं याजनं तथा । दानं प्रतिग्रहं चैव ब्राह्मणानामकल्पयत् ॥ ८८ ॥
To Brahmanas he assigned teaching and studying (the Veda), sacrificing for their own benefit and for others, giving and accepting (of alms).
english translation
adhyApanamadhyayanaM yajanaM yAjanaM tathA । dAnaM pratigrahaM caiva brAhmaNAnAmakalpayat ॥ 88 ॥
hk transliteration by Sanscript