Ramayana
कृतार्था ह्यकृतार्थानां मित्राणां न भवन्ति ये । तान्मृतानपि क्रव्यादाः कृतघ्नान्नोपभुञ्जते ॥ ४-३०-७३
'Even the carnivorous animals dislike to eat the body of such ungrateful men who do not help their friends even though they have received help and have achieved their objective.' ॥ 4-30-73॥
english translation
kRtArthA hyakRtArthAnAM mitrANAM na bhavanti ye । tAnmRtAnapi kravyAdAH kRtaghnAnnopabhuJjate ॥ 4-30-73
hk transliteration by Sanscript