Musannaf Ibn Abi Shaybah 9858 — How many days there are in a month

Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: Once the Messenger of Allah (peace and blessings be upon him) said: "How much of the month has passed?" We said: "Twenty-two days have passed and eight remain." The Prophet (peace and blessings be upon him) said: "No, rather twenty-two days have passed and seven remain. Seek it tonight." Then the Prophet (peace and blessings be upon him) said: "The month is like this, the month is like this", three times, and he held back one finger.