Silsilah as-Sahihah 1924 — Ruling on drinking directly from a water

It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) forbade bending the mouth of a waterskin from the top and drinking water from the inside.

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) forbade us from turning the mouth of a vessel upwards and drinking water from the inside.