I was asked to deliver the sermon in the prayer for rain, so I recited Surah Qaf in the sermon. Is my action valid?

Question:
May Allah reward you, Your Eminence, father. The questioner says: I went to the mosque today to perform the prayer for rain, and the imam was delayed. There were about ten men in the mosque, and they asked me to lead the prayer and deliver the sermon. I was not prepared for it, and it was a surprise to me, so I led the prayer and recited Surah Qaf in the sermon. Is my action valid?

Answer:
First, is this mosque authorized for the prayer for rain to be held in it? If it is authorized, I do not think that only ten men would come; people will come. As for you, you did well; you did what you could, and you did well. May Allah reward you with good. But if you had added to this a supplication asking Allah for rain and rainfall for the Muslims, that would not burden you, and that is what is required of the prayer for rain. Yes.