Shiva Purana
यो वै सामर्थ्ययुक्तश्च नोपकारं करोति वै ॥ तत्सामर्थ्यं भवेद्व्यर्थं परत्र नरकं व्रजेत् ॥ ५७ ॥
If a person does not help others though he is capable of it, all his efficiency is vain. He will fall into hell after death.
english translation
yo vai sAmarthyayuktazca nopakAraM karoti vai ॥ tatsAmarthyaM bhavedvyarthaM paratra narakaM vrajet ॥ 57 ॥
hk transliteration by Sanscript