مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3692
The Offices of Commander and Qadi
Section 1
وَعَنْ أَنَسٍ قَالَ: كَانَ قَيْسُ بْنُ سَعْدٍ مِنَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِمَنْزِلَةِ صاحبِ الشُّرَطِ منَ الأميرِ. رَوَاهُ البُخَارِيّ
Anas said that Qais b. Sa‘d had a position in relation to the Prophet (ﷺ) like that of a prefect of a district in relation to a governor. Bukhari transmitted it.
Mishkat al-Masabih, 3692صَحِيح (الألباني)