Mishkat al-Masabih #1420
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَائِشَةَ قَالَتْ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا رَأَى الْمَطَرَ قَالَ: «اللَّهُمَّ صيبا نَافِعًا» . رَوَاهُ البُخَارِيّ
‘A'isha told that when God's Messenger saw rain he said, “O God, send a beneficial downpour."
Bukhari transmitted it.
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About Mishkat al-Masabih
This hadith is #1420 from Mishkat al-Masabih, in the Book of Prayer.