It was narrated from Hisham binIshaq bin Abdullah bin Kinanah that:His father said: "I asked Ibn 'Abbas how the Messenger of Allah (ﷺ) prayed for rain. He said: 'The Messenger of Allah (ﷺ) went out (dressed) in a state of humility, beseeching and humble. He sat on the minbar but he did not deliver a Khutbah like this Khutbah of yours, rather he kept supplicating, beseeching and saying the takbir, and he prayed two rak'ahs as he used to do during the two 'Eids

English translation · Sunan an-Nasa'i