Narrated He reported God’s Messenger as saying, “There are three to whom God will not speak and at whom He will not look on the day of resurrection:
a man who swears falsely about some merchandise that he has previously received a larger offer than he has now been given; a man who swears a false oath after the afternoon prayer to deprive thereby a Muslim of his property; and a man who withholds excess water. God will say, ‘Today I am withholding from you my grace*as you withheld excess water which was not produced by the efforts of your hands’."
(Bukhari and Muslim.)
*The word for grace (fadl) is the same as the word for excess.
‘Urwa said az-Zubair had a dispute with one of the Ansar about streamlets in the lava plain, and the Prophet said, “Water your ground, Zubair, then let the water run to your neighbour.” The Ansari said, “It is because he is your cousin.” Thereupon his face changed colour and he said, “Water your ground, Zubair, then keep back the water till it returns to the embankment, and afterwards let it run to your neighbour.” So the Prophet paid regard to az-Zubair’s right by the clear decision when the Ansari made him angry and he had given them advice which would have made matters easy for both of them.