[Machine] Umar said, "If you are three, then appoint one of you in charge. And if you pass by a camel herder, call out 'O camel herder!' If he answers you, then ask him to give you water. And if he does not answer you, then force the camel to lie down, and drink its milk." This is reported by Umar with a good chain of narrators, and it is considered necessary according to us. And Allah knows best.  

قَالَ عُمَرُ ؓ إِذَا كُنْتُمْ ثَلَاثَةً فَأَمِّرُوا عَلَيْكُمْ وَاحِدًا مِنْكُمْ فَإِذَا مَرَرْتُمْ بِرَاعِي الْإِبِلِ فَنَادُوا يَا رَاعِيَ الْإِبِلِ فَإِنْ أَجَابَكُمْ فَاسْتَسْقُوهُ وَإِنْ لَمْ يُجِبْكُمْ فَأْتُوهَا فُحُلُّوهَا وَاشْرَبُوا ثُمَّ صُرُّوهَا هَذَا عَنْ عُمَرَ ؓ صَحِيحٌ بِإِسْنَادَيْهِ جَمِيعًا وَهُوَ عِنْدَنَا مَحْمُولٌ عَلَى حَالِ الضَّرُورَةِ وَاللهُ أَعْلَمُ