“The Messenger of Allah ﷺ said: ‘The month is like that and like that and like that,’ and he showed nine fingers on the third time to indicate twenty-nine.” (Using translation from Ibn Mājah 1657)
قَالَ رَسُولُ اللهِ ﷺ الشَّهْرُ هَكَذَا وَهَكَذَا وَهَكَذَا يَعْنِي تِسْعًا وَعِشْرِينَ