"I asked the Messenger of Allah ﷺ about a lost camel that comes to my cisterns that I have prepared for my own camels - will I be rewarded if I give it some water to drink? He said: Yes, in every living being there is reward.'" (Using translation from Ibn Mājah 3686)
سَأَلْتُ رَسُولَ اللهِ ﷺ عَنْ الضَّالَّةِ مِنَ الْإِبِلِ تَغْشَى حِيَاضِي قَدْ لُطْتُهَا للِإِبِلٍ هَلْ لِي مِنْ أَجْرٍ فِي شَأْنِ مَا أَسْقِيهَا؟ قَالَ نَعَمْ فِي كُلِّ ذَاتِ كَبِدٍ حَرَّى أَجْرٌ