عَنْ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: لَوْ يُعْطَى النَّاسُ بِدَعْوَاهُمْ، لَادَّعَى رِجَالٌ أَمْوَالَ قَوْمٍ وَدِمَاءَهُمْ، لَكِنِّ الْبَيِّنَةُ عَلَى الْمُدَّعِي، وَالْيَمِينَ عَلَى مَنْ أَنْكَرَ. حَدِيثٌ حَسَنٌ، رَوَاهُ الْبَيْهَقِيّ وَغَيْرُهُ، وَبَعْضُهُ فِي الصَّحِيحَيْنِ

33 – It is reported on the authority of ibn ‘Abbās (may Allāh be pleased with them both), that the Messenger of Allāh (peace and blessings of Allāh be upon him) said:

“Were people to be given everything that they claimed, men would [unjustly] claim the wealth and lives of [other] people. But, the burden of proof is upon the claimant, and the taking of an oath is upon him who denies.” [A ḥasan ḥadīth reported by Bayhaqī and others [1], and part of it is in the two ṣaḥīḥs]

• Ṣaḥīḥ al-Bukhārī (2514, 2668 & 4552) • Ṣaḥīḥ Muslim (1711) • Sunan Abī Dāwūd (3619) • Sunan at-Tirmidhī (1342) • Sunan ibn Mājah (2321) • Mishkāt al-Maṣābīḥ (3758)
[1] Sunan al-Kubrā (21197-21203 (10/426-427 [10/252]))