Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:430-83b
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السيوطي:٤٣٠-٨٣b

"رَكِبَ عُمَرُ فَرَسًا عَلَى عَهْد النَّبِىِّ ﷺ فَرَكَضَهُ فَانْكَشَفَ فَخِذُهُ، فَرَأَى أَهلُ نَجْرَانَ عَلَى فَخذهِ شَامَةً سَوْدَاءَ، فَقَالُوا: هَذَا الَّذِى نَجدُهُ فِى كِتَابِنَا أَنَّه يُخْرِجُنَا مِنْ أَرْضِنَا".  

أبو نَعيم في المعرفة، وسنده صحيح

See similar narrations below:

Collected by Aḥmad's Zuhd
ahmad-zuhd:650ʿAbdullāh > Dāwud b. ʿUmar > Sharīk b. ʿAbdullāh > Abū Isḥāq > Abū ʿUbayd

[Machine] Umar rode a horse during the time of the Messenger of Allah ﷺ, and his thigh was exposed from beneath his cloak. A man from the people of Najran saw a mark on his thigh and said, "This is what we find in our scriptures that will drive us out of our lands."  

الزهد لأحمد:٦٥٠حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنَا دَاوُدُ بْنُ عُمَرَ حَدَّثَنَا شَرِيكُ بْنُ عَبْدِ اللَّهِ عَنْ أَبِي إِسْحَاقَ عَنْ أَبِي عُبَيْدٍ قَالَ

رَكَضَ عُمَرُ فَرَسًا عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ فَانْكَشَفَتْ فَخِذُهُ مِنْ تَحْتِ الْعَبَاءَةِ؛ فَأَبْصَرَ رَجُلٌ مِنْ أَهْلِ نَجْرَانَ شَامَةً فِي فَخِذِهِ فَقَالَ «هَذَا الَّذِي نَجِدُهُ فِي كِتَابِنَا يُخْرِجُنَا مِنْ دِيَارِنَا»