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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:12075 – Abū Aḥmad al-Mihrajānī > Abū Bakr b. Jaʿfar al-Muzakkī > Muḥammad b. Ibrāhīm > Ibn Bukayr > Mālik > Yaḥyá b. Saʿīd > Saʿīd b. al-Musayyib > ʿUmar b. al-Khaṭṭāb

[Machine] And he is a leaning support against the Kaaba, whoever takes a stray object, he is a stray.  

البيهقي:١٢٠٧٥ – أَخْبَرَنَا أَبُو أَحْمَدَ الْمِهْرَجَانِيُّ أنبأ أَبُو بَكْرِ بْنُ جَعْفَرٍ الْمُزَكِّي ثنا مُحَمَّدُ بْنُ إِبْرَاهِيمَ ثنا ابْنُ بُكَيْرٍ ثنا مَالِكٌ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ أَنَّ عُمَرَ بْنَ الْخَطَّابِ ؓ قَالَ

وَهُوَ مُسْنِدٌ ظَهْرَهُ إِلَى الْكَعْبَةِ مَنْ أَخَذَ ضَالَّةً فَهُوَ ضَالٌّ  

See similar narrations below:

Collected by Mālik
malik:36-68 – Mālik > Yaḥyá b. Saʿīd > Saʿīd b. al-Musayyab > ʿUmar b. al-Khaṭṭāb

Malik related to me from Yahya ibn Said from Said ibn al-Musayyab that Umar ibn al-Khattab said while he was leaning his back against the Kaba, "Whoever takes a stray is astray."  

مالك:٣٦-٦٨ – وَحَدَّثَنِي مَالِكٌ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ أَنَّ عُمَرَ بْنَ الْخَطَّابِ

قَالَ وَهُوَ مُسْنِدٌ ظَهْرَهُ إِلَى الْكَعْبَةِ مَنْ أَخَذَ ضَالَّةً فَهُوَ ضَالٌّ