Sahih Muslim
The Book of Oaths, Muharibin, Qasas (Retaliation), and Diyat (Blood Money) — Hadith #4228
Scholarly Consensus: Sahih How we grade
وَحَدَّثَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا سِمَاكُ، بْنُ حَرْبٍ عَنْ مُعَاوِيَةَ بْنِ قُرَّةَ، عَنْ أَنَسٍ، قَالَ أَتَى رَسُولَ اللَّهِ صلى الله عليه وسلم نَفَرٌ مِنْ عُرَيْنَةَ فَأَسْلَمُوا وَبَايَعُوهُ وَقَدْ وَقَعَ بِالْمَدِينَةِ الْمُومُ - وَهُوَ الْبِرْسَامُ - ثُمَّ ذَكَرَ نَحْوَ حَدِيثِهِمْ وَزَادَ وَعِنْدَهُ شَبَابٌ مِنَ الأَنْصَارِ قَرِيبٌ مِنْ عِشْرِينَ فَأَرْسَلَهُمْ إِلَيْهِمْ وَبَعَثَ مَعَهُمْ قَائِفًا يَقْتَصُّ أَثَرَهُمْ .
There came to Allah's Messenger (ﷺ) some ponple from 'Uraina. They embraced Islam and swore allegiance to him and there had spread at that time pleurisy. The rest of the hadith is the same (but with this addition):" There were by his (the Prophet's) side about twenty young men of the Ansar; he sent them (behind) them (culprits), and he also sent along with them one expert in following the track so that he might trace their footprints."
See also hadith 11504.
Chain of Narration (Isnad)
Hadith Grading
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Scholarly Consensus: Sahih