‏الأشربة : Hadeeth No:5015 Abu Sa'id Khudri reported that Allaah's, Messenger (may peace he upon him) forbade from turning the waterskins upside down and drinking from their mouths....

‏البيوع : Hadeeth No:3802 Abu Huraira (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: The excess of water should not be sold in order to enable the sate of herbage....