The gift to one who has fallen away from the path of virtue and the gift of wealth which has been earned wrongly and dishonestly are both useless. The gifts to a fallen Brahmana, to a thief to a false preceptor, are also useless.
आरूढपतिते दत्तमन्यायोपहृतं च यत्। व्यर्थंतु पतिते दानं ब्राह्मणे तस्करे तथा॥