Ali bin Sa'id bin Jryr علي بن سعيد بن جرير · The Book of Fasting

"The month is like this," and (one of the narrators) Shubah did the same gesture as Jabalah had done, copying, Ibn 'Umar: "It is twenty-nine, as he gestured twice with all fingers of both hands, and putting down one of his fingers the third time."