Man Lā Yaḥḍuruh al-Faqīh
Hadith 6453762 - وَ قَالَ عَلَيْهِ اَلسَّلاَمُ : "أَيُّمَا رَجُلٍ اِشْتَرَى مِنْ رَجُلٍ بَيْعاً فَهُمَا بِالْخِيَارِ حَتَّى يَفْتَرِقَا فَإِذَا اِفْتَرَقَا فَقَدْ وَجَبَ اَلْبَيْعُ".
Hadith.3762 - Imam (as) said: "Whenever a man buys something from another man, they both have the option (to cancel the deal) until they part ways. Once they part, the sale becomes binding."