عن أبي هريرة وعبد الله بن عباس رضي الله عنهم قالا: نَهَى رسولُ اللهِ صلى الله عليه وسلم أَنْ يُشْرَبَ مِنْ فِي السِّقاءِ أو القِرْبَةِ.
The Messenger of Allah (may Allah's peace and blessings be upon him) prohibited drinking directly from the mouth of a waterskin because of the fear of harm. There could be something in it that the one drinking can not see, and it might get into his stomach.
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