Muwatta Malik #1546
Judgements
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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 .
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."
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About Muwatta Malik
This hadith is #1546 from Muwatta Malik, in the Book of Judgements.