Abbad bin Tameem Mazni · Invoking Allah for Rain (Istisqaa)

The Prophet (p.b.u.h) went out to offer the Istisqa' prayer and turned (and put on) his cloak inside out.

that his uncle (who was one of the companions of the Prophet) had told him, "The Prophet (ﷺ) went out with the people to invoke Allah for rain for them. He stood up and invoked Allah for rain, then faced the Qibla and turned his cloak (inside out) and it rained."

from his uncle who said, "The Prophet (ﷺ) went out to invoke Allah for rain. He faced the Qibla invoking Allah. He turned over his cloak (inside out) and then offered two rak`at and recited the Qur'an aloud in them."

"I saw the Prophet (ﷺ) on the day when he went out to offer the Istisqa' prayer. He turned his back towards the people and faced the Qibla and asked Allah for rain. Then he turned his cloak inside out and led us in a two rak`at prayer and recited the Qur'an aloud in them."