Sahih al-Bukhari Book 68, Hadith 51
The Prophet (holding out his ten fingers thrice), said, "The month is thus and thus and thus," namely
thirty days. Then (holding out his ten fingers twice and then nine fingers), he said, "It may be thus and
thus and thus," namely twenty nine days. He meant once thirty days and once twenty nine days.
(a companion of Allah's Messenger (ﷺ)) Allah's Messenger (ﷺ), holding out his middle and index fingers, said, "My advent and the Hour's are like this (or like these)," namely, the period between his era and the Hour is like the distance between those two fingers, i.e., very short.
The Prophet (ﷺ) pointed with his hand towards Yemen and said twice, "Faith is there," and then pointed towards the East, and said, "Verily, sternness and mercilessness are the qualities of those who are busy with their camels and pay no attention to their religion, where the two sides of the head of Satan will appear," namely, the tribes of Rabl'a and Muqar.