he saw the Messenger of Allah at Ahjar Az-Zait, supplicating for rain, and he was raising his hands in supplication.
Jami` at-Tirmidhi Book 6, Hadith 14
← Previous Hadith "The Messenger of Allah went out with the people to seek rain. So he led them in prayer for two Rak'ah, reciting aloud in them, turning his upper wrap around, raising his hands, requesting rain, and facing the Qiblah."

Jami` at-Tirmidhi Book 6, Hadith 13 Next Hadith → "Al-Walid bin Uqbah, the governor of Al-Madinah, sent me to ask Ibn Abbas about how the Messenger of Allah would perform Salat Al-Istisqa. I came to him and he said: 'The Messenger of Allah would go out in modest dress, humbly, imploring, until he reached the Musalla. He would not give this Khutbah of yours, rather, he would continue supplication and imploring saying the Takbir, and pray two Rak'ah, just as he would pray for the Eid.'"

Jami` at-Tirmidhi Book 6, Hadith 15