Hatm bin Isma'il al-Madni حاتم بن إسماعيل المدني · The Book on Traveling

"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.'"