Manusmriti
क्रीत्वा विक्रीय वा किं चिद् यस्यैहानुशयो भवेत् । सोऽन्तर्दशाहात् तद् द्रव्यं दद्याच्चैवाददीत वा ॥ २२२ ॥
If anybody in this (world), after buying or selling anything, repent (of his bargain), he may return or take (back) that chattel within ten days.
english translation
krItvA vikrIya vA kiM cid yasyaihAnuzayo bhavet । so'ntardazAhAt tad dravyaM dadyAccaivAdadIta vA ॥ 222 ॥
hk transliteration by Sanscript