حَدَّثَنَا عَبْد اللَّهِ قَالَ قَرَأْتُ عَلَى أَبِي حَدَّثَنَا عُمَرُ بْنُ سَعْدٍ أَبُو دَاوُدَ حَدَّثَنَا سُفْيَانُ عَنْ مَعْنٍ عَنِ الْقَاسِمِ قَالَ اخْتَلَفَ عَبْدُ اللَّهِ وَالْأَشْعَثُ فَقَالَ ذَا بِعَشَرَةٍ وَقَالَ ذَا بِعِشْرِينَ قَالَ اجْعَلْ بَيْنِي وَبَيْنَكَ رَجُلًا قَالَ أَنْتَ بَيْنِي وَبَيْنَ نَفْسِكَ قَالَ أَقْضِي بِمَا قَضَى بِهِ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا اخْتَلَفَ الْبَيِّعَانِ وَلَمْ تَكُنْ بَيِّنَةٌ فَالْقَوْلُ قَوْلُ الْبَائِعِ أَوْ يَتَرَادَّانِ الْبَيْعَ
مسند امام احمد بن حنبل · Hadith 4447
It was narrated that al-Qaasim said: 'Abdullah and al-Ash'ath had a disagreement. One said ten and the other said twenty. He said: Appoint a man (to judge) between me and you. He said: You may judge between me and yourself. He said: I shall judge in accordance with the verdict of the Messenger of Allah (PBUH): "If the two parties to a transaction disagree and there is no proof, what counts is what the seller says or they may cancel the deal and take back (what each gave to the other)."
Sanad
حَدَّثَنَا عَبْد اللَّهِ قَالَ قَرَأْتُ عَلَى أَبِي حَدَّثَنَا عُمَرُ بْنُ سَعْدٍ أَبُو دَاوُدَ حَدَّثَنَا سُفْيَانُ عَنْ مَعْنٍ عَنِ الْقَاسِمِ قَالَ اخْتَلَفَ عَبْدُ اللَّهِ وَالْأَشْعَثُ فَقَالَ ذَا بِعَشَرَةٍ وَقَالَ ذَا بِعِشْرِينَ قَالَ اجْعَلْ بَيْنِي وَبَيْنَكَ