Jami` at-Tirmidhi 557
جامع الترمذي#557SahihUmair, the freed slave of Abi Al-Lahm narrated from Abi Al-Lahm that :he saw the Messenger of Allah at Ahjar Az-Zait, supplicating for rain, and he was raising his hands in supplication
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 6:14