It was narrated from Abu Al Malih that his father said:

"We were with the Messenger of Allah ﷺ in Hunain and it rained. The
caller of the Messenger of Allah ﷺ
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 ﷺ بِحُنَيْنٍ فَأَصَابَنَا مَطَرٌ فَنَادَى مُنَادِي رَسُولِ اللَّهِ ﷺ أَنْ صَلُّوا فِي رِحَالِكُمْ .