Shiva Purana
उपकारकरस्यैव यत्पुण्यं जायते त्विह ॥ तत्पुण्यं शक्यते नैव वक्तुं वर्षशतैरपि ॥ २६ ॥
It is imposible to expatiate on the merit of a person who helps others even if we take a hundred years.
english translation
upakArakarasyaiva yatpuNyaM jAyate tviha ॥ tatpuNyaM zakyate naiva vaktuM varSazatairapi ॥ 26 ॥
hk transliteration by Sanscript