Allah's Messenger (ﷺ) forbade the practice of An-Najsh.
Sahih al-Bukhari Book 90, Hadith 10
← Previous Hadith Allah's Messenger (ﷺ) said, "One should not prevent others from watering their animals with the surplus of his water in order to prevent them from benefiting by the surplus of grass."

Sahih al-Bukhari Book 90, Hadith 9 Next Hadith → A man mentioned to the Prophet (ﷺ) that he had always been cheated in bargains. The Prophet (ﷺ) said, "Whenever you do bargain, say, 'No cheating.'"

Sahih al-Bukhari Book 90, Hadith 11