Narrated Samurah ibn Jundub:

The Prophet ﷺ said: When one of you comes to the cattle, he should seek permission of their master if he is there; if he permits, he should milk (the animals) and drink. If he is not there, he should call three times. If he responds, he should seek his permission; otherwise, he may milk (the animals) and drink, but should not carry (with him).

حَدَّثَنَا عَيَّاشُ بْنُ الْوَلِيدِ الرَّقَّامُ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ بْنِ جُنْدُبٍ، أَنَّ نَبِيَّ اللَّهِ ﷺ قَالَ " إِذَا أَتَى أَحَدُكُمْ عَلَى مَاشِيَةٍ فَإِنْ كَانَ فِيهَا صَاحِبُهَا فَلْيَسْتَأْذِنْهُ فَإِنْ أَذِنَ لَهُ فَلْيَحْلِبْ وَلْيَشْرَبْ فَإِنْ لَمْ يَكُنْ فِيهَا فَلْيُصَوِّتْ ثَلاَثًا فَإِنْ أَجَابَهُ فَلْيَسْتَأْذِنْهُ وَإِلاَّ فَلْيَحْتَلِبْ وَلْيَشْرَبْ وَلاَ يَحْمِلْ " .