Hadith #1526 (Sunan al-Nasa'i)
Book: The Book of Praying for Rain (Al-Istisqa')
Narrator(s): Abd al-Jabbar bin al-'Ala' عبد الجبار بن العلاء بن عبد الجبار, Abu Sa'id al-Khudri, Amr bin Dinar عمرو بن دينار الأثرم الجمحي, Atab bin Hnyn عتاب بن حنين, Sufyan bin 'Uyaynah سفيان بن عيينة

His father said: “One of the governors sent me to Ibn Abbas to ask him about the prayer for rain. He said: ‘What kept him from asking me? The Messenger of Allah (ﷺ) went out humbly, (dressed) in a state of humility, submissiveness and beseeching, and he prayed two rak’ahs as in the Eid prayer, but he did not deliver a Khutbah like this Khutbah of yours.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-1526/