Abu Dawud Book 2, Hadith Number 1163.
Chapter : Not known.
Narated By Abdullah ibn Abbas : Ishaq ibn Abdullah ibn Kinanah reported: Al-Walid ibn Utbah or (according to the version of Uthman) al-Walid ibn Uqbah, the then governor of Medina, sent me to Ibn Abbas to ask him about the prayer for rain offered by the Apostle of Allah (PBUH). He said: The Apostle of Allah (PBUH) went out wearing old clothes in a humble and lowly manner until he reached the place of prayer. He then ascended the pulpit, but he did not deliver the sermon as you deliver (usually). He remained engaged in making supplication, showing humbleness (to Allah) and uttering the takbir (Allah is most great). He then offered two rak’ahs of prayer as done on the ‘Id (festival).