Mishkat al-Masabih 11 Business Transactions كتاب البيوع 188

وَعَن الْحسن عَن سَمُرَة أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا أَتَى أَحَدُكُمْ عَلَى مَاشِيَةٍ فَإِنْ كَانَ فِيهَا صَاحِبُهَا فَلْيَسْتَأْذِنْهُ وَإِنْ لَمْ يَكُنْ فِيهَا فَلْيُصَوِّتْ ثَلَاثًا فَإِنْ أَجَابَهُ أَحَدٌ فَلْيَسْتَأْذِنْهُ وَإِنْ لَمْ يُجِبْهُ أَحَدٌ فَلْيَحْتَلِبْ وَلْيَشْرَبْ وَلَا يَحْمِلْ» . رَوَاهُ أَبُو دَاوُد

Al-Hasan on Samura’s authority reported the Prophet as saying, “When any of you comes upon animals whose owner is among them he must ask his permission; if not he must call three times and if anyone answers him he must ask his permission; but if no one answers him he may draw some milk and drink, but not carry any away.” Abu Dawud transmitted it.