Sunan an-Nasa'i, Hadith 854 ⓘ
It was narrated from Abu Al Malih that his father said: "We were with the Messenger of Allah in Hunain and it rained. The caller of the Messenger of Allah called out, telling us: 'Pray where you are."'
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَبِي الْمَلِيحِ، عَنْ أَبِيهِ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم بِحُنَيْنٍ فَأَصَابَنَا مَطَرٌ فَنَادَى مُنَادِي رَسُولِ اللَّهِ صلى الله عليه وسلم أَنْ صَلُّوا فِي رِحَالِكُمْ .
also referenced under: Book 10, Hadith 78 (In-Book) & Volume 1, Book 10, Hadith 855 (DarusSalam)