"There were two female neighbors who used to do leatherwork (with an awl) in At-Ta'if. One of them came out with her hand bleeding and claimed that her companion had injured her, but the other one denied it. I wrote to Ibn 'Abbas concerning that. He wrote, (saying) that the Messenger of Allah [SAW] ruled that the person against whom the claim was made should swear an oath. For if people were to be given what they claimed was theirs, then people would make claims against the wealth and blood of others." So he called her and recited this Verse to her: "Verily, those who purchase a small gain at the cost of Allah's Covenant and their oaths, they shall have no portion in the Hereafter..." until the end of the Verse. He called her and recited that to her, and she confessed to that. News of that reached him and he was happy.  

كَانَتْ جَارِيَتَانِ تَخْرُزَانِ بِالطَّائِفِ فَخَرَجَتْ إِحْدَاهُمَا وَيَدُهَا تَدْمَى فَزَعَمَتْ أَنَّ صَاحِبَتَهَا أَصَابَتْهَا وَأَنْكَرَتِ الأُخْرَى فَكَتَبْتُ إِلَى ابْنِ عَبَّاسٍ فِي ذَلِكَ فَكَتَبَ أَنَّ رَسُولَ اللَّهِ ﷺ قَضَى أَنَّ الْيَمِينَ عَلَى الْمُدَّعَى عَلَيْهِ وَلَوْ أَنَّ النَّاسَ أُعْطُوا بِدَعْوَاهُمْ لاَدَّعَى نَاسٌ أَمْوَالَ نَاسٍ وَدِمَاءَهُمْ فَادْعُهَا وَاتْلُ عَلَيْهَا هَذِهِ الآيَةَ { إِنَّ الَّذِينَ يَشْتَرُونَ بِعَهْدِ اللَّهِ وَأَيْمَانِهِمْ ثَمَنًا قَلِيلاً أُولَئِكَ لاَ خَلاَقَ لَهُمْ فِي الآخِرَةِ } حَتَّى خَتَمَ الآيَةَ فَدَعَوْتُهَا فَتَلَوْتُ عَلَيْهَا فَاعْتَرَفَتْ بِذَلِكَ فَسَرَّهُ  

[Machine] About two women who had a dispute, one of them went out and claimed that her companion had hit her with a whip, while the other denied it. So Ibn Abbas wrote to me saying that the Messenger of Allah ﷺ decided, "Verily, the right lies with the accused, and even if people were given to claim their oaths, then some among the people would claim the wealth and blood of others, but let her make an oath." So I recited to her: "Indeed, those who exchange the covenant of Allah and their own oaths for a small price - those will have no share in the Hereafter." She confessed, and he was pleased with that.  

عَنِ امْرَأَتَيْنِ كَانَتَا تَخْرِزَانِ فَخَرَجَتْ إِحْدَاهُمَا فَادَّعَتْ أَنَّ صَاحِبَتَهَا ضَرَبَتْهَا بِالْاشفا وَأَنْكَرَتِ الْأُخْرَى فَكَتَبَ إِلَيَّ ابْنُ عَبَّاسٍ أَنَّ رَسُولَ اللهِ ﷺ قَضَى «أَنَّ الْيَمِينَ عَلَى الْمُدَّعَى عَلَيْهِ وَلَوْ أَنَّ النَّاسَ أُعْطُوا دَعْوَاهُمْ لَادَّعَى أُنَاسٌ مِنَ النَّاسِ أَمْوَالَ أُنَاسٍ وَدِمَاءَهُمْ وَلَكِنِ ادْعُهَا» فاتْلُ عَلَيْهَا {إِنَّ الَّذِينَ يَشْتَرُونَ بِعَهْدِ اللهِ وَأَيْمَانِهِمْ ثَمَنًا قَلِيلًا أُولَئِكَ لَا خَلَاقَ لَهُمْ فِي الْآخِرَةِ} قَالَ فَفَعَلْتُ فَاعْتَرَفَتْ فَبَلَغَهُ ذَلِكَ فَسُرَّ بِهِ  

[Machine] The Messenger of Allah ﷺ ruled that the burden of proof is on the plaintiff, even if people were given based on their claims. People will make claims regarding others' lives and wealth, so make your claim and recite upon it: "Indeed, those who exchange the covenant of Allah and their [own] oaths for a small price will have no share in the hereafter, and Allah will not speak to them or look at them on the Day of Resurrection, nor will He purify them; and they will have a painful punishment." [Surah Al-Imran 3:77]. It is said that Ibn Abbas acknowledged this, and he explained its meaning.  

رَسُولَ اللهِ ﷺ قَضَى أَنَّ الْيَمِينَ عَلَى الْمُدَّعَى عَلَيْهِ وَلَوْ أَنَّ النَّاسَ أُعْطُوا بِدَعْوَاهُمُ ادَّعَى نَاسٌ دِمَاءَ أُنَاسٍ وَأَمْوَالَهُمْ فَادْعُهَا وَاقْرَأْ عَلَيْهَا {إِنَّ الَّذِينَ يَشْتَرُونَ بِعَهْدِ اللهِ وَأَيْمَانِهِمْ ثَمَنًا قَلِيلًا أُولَئِكَ لَا خَلَاقَ لَهُمْ فِي الْآخِرَةِ وَلَا يُكَلِّمُهُمُ اللهُ وَلَا يَنْظُرُ إِلَيْهِمْ يَوْمَ الْقِيَامَةِ وَلَا يُزَكِّيهِمْ وَلَهُمْ عَذَابٌ أَلِيمٌ} [آل عمران 77] قَالَ فَاعْتَرَفَتْ فَبَلَغَ ذَلِكَ ابْنَ عَبَّاسٍ فَسَّرَهُ