"Qais bin Sa'd used to be, to the Prophet ﷺ, in the position of the head of police for a ruler." (One of the narrators) Al-Ansari said: "That is: Due to his affairs that he takes charge of."  

كَانَ قَيْسُ بْنُ سَعْدٍ مِنَ النَّبِيِّ ﷺ بِمَنْزِلَةِ صَاحِبِ الشُّرَطِ مِنَ الأَمِيرِ قَالَ الأَنْصَارِيُّ يَعْنِي مِمَّا يَلِي مِنْ أُمُورِهِ