50. upakāro hi nīcānām

उपकारो हि नीचानाम्
अपकारो हि जायते ।
पयःपानं भुजङ्गानां
केवलं विषवर्धनम् ॥

upakāro hi nīcānām
apakāro hi jāyate

payaḥpānaṃ bhujaṅgānāṃ
kevalaṃ viṣavardhanam

नीचानाम् उपकारः हि (nīcānām upakāraḥ hi) = helping a wicked indeed
अपकारः हि जायते (apakāraḥ hi jāyate) = gives rise to harm alone
भुजङ्गानां पयःपानं (bhujaṅgānāṃ payaḥpānaṃ) = feeding milk to snakes
केवलं विषवर्धनम् (kevalaṃ viṣavardhanam) = only increases (their) poison.

Meaning: Helping the wicked / evil only bears misdeeds. Feeding milk to snakes only increases their poison.

Credits: Courtesy Brahmachari Ved Chaitanya of Chinmaya International Foundation (CIF)
Image courtesy: Flaticon
P.S.: All errors / mistakes are my own