I heard Messenger of Allah ﷺ forbidding the drinking of water by bending the mouths of water skins, i.e., drinking from the mouths directly.
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَنْهَى عَنِ اخْتِنَاثِ الأَسْقِيَةِ قَالَ عَبْدُ اللَّهِ قَالَ مَعْمَرٌ أَوْ غَيْرُهُ هُوَ الشُّرْبُ مِنْ أَفْوَاهِهَا