Hadith: Indeed, Allah has put the truth upon the tongue and in the heart of ‘Umar

عن ابن عمر رضي الله عنهما أن رسول الله صلى الله عليه وسلم قال: «إنَّ اللهَ جَعَل الحقَّ على لِسان عمر وقَلْبه». وقال ابن عمر: ما نَزَل بالناس أمرٌ قطُّ فقالوا فيه، وقال فيه عمر، إلا نَزَل فيه القرآن على نَحْوِ ما قال عمر.
[صحيح] - [رواه الترمذي وأحمد]

Ibn ‘Umar (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "Indeed, Allah has put the truth upon the tongue and in the heart of ‘Umar." Ibn ‘Umar added: "Never did something occur among people, regarding which they judged and ‘Umar judged, except that the Qur’an was revealed about it in line with what ‘Umar had said."
[Authentic hadith] - [Narrated by At-Termedhy - Narrated by Ahmad]

Explanation

Ibn ‘Umar (may Allah be pleased with him) reports from the Messenger of Allah (may Allah's peace and blessings be upon him) that Allah made the truth appear upon the tongue and in the heart of ‘Umar. That was a fixed and instinctive quality of ‘Umar. His son Ibn ‘Umar further says that nothing ever happened during the Prophet's lifetime and that the Companions, including ‘Umar, had their own say about it except that the Qur’an was revealed in agreement with Umar's opinion.