Hadith 444
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Hadith.3975 - Imam Jafar ibn Muhammad Al-Sadiq (as) said regarding a man who sells something and the buyer claims that it was sold for a lower price than what the seller stated:
"The statement of the seller is to be accepted if the item is still present in its original form, along with his oath."
3975 - قَالَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ : فِي اَلرَّجُلِ يَبِيعُ اَلشَّيْءَ فَيَقُولُ اَلْمُشْتَرِي هُوَ بِكَذَا وَ كَذَا بِأَقَلَّ مِمَّا قَالَ اَلْبَائِعُ قَالَ "اَلْقَوْلُ قَوْلُ اَلْبَائِعِ إِذَا كَانَ اَلشَّيْءُ قَائِماً بِعَيْنِهِ مَعَ يَمِينِهِ ".