"We are an unlettered Ummah, we do not use astronomical counting or computation. The month is like this, and this, and this," he did three times, showing it as twenty-nine.
Sunan an-Nasa'i Book 22, Hadith 51
← Previous Hadith " I heard the Messenger of Allah say: 'The month is twenty-nine days."'

Sunan an-Nasa'i Book 22, Hadith 50 Next Hadith → he heard Ibn 'Umar narrate that the Prophet said; "We are an unlettered Ummah; we do not use computation. The month is like this, and this, and this," and he held down his thumb the last time. "And the month is like this, and this, and this," completing thirty.

Sunan an-Nasa'i Book 22, Hadith 52