Sunan an-Nasa'i, Volume 1, Book 7, Hadith 654 (DarusSalam)

It was narrated that 'Amr bin Aws said: "A man of Thaqif told us that he heard the caller of the Messenger of Allah on a rainy night during a journey saying: 'Hayya 'ala as-salah, Hayya 'ala al'falah, sallu fi rihalikum (Come to prayer, come to prosperity, pray in your dwellings).'"

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرِو بْنِ دِينَارٍ، عَنْ عَمْرِو بْنِ أَوْسٍ، يَقُولُ أَنْبَأَنَا رَجُلٌ، مِنْ ثَقِيفٍ أَنَّهُ سَمِعَ مُنَادِيَ النَّبِيِّ، صلى الله عليه وسلم يَعْنِي فِي لَيْلَةٍ مَطِيرَةٍ فِي السَّفَرِ يَقُولُ حَىَّ عَلَى الصَّلاَةِ حَىَّ عَلَى الْفَلاَحِ صَلُّوا فِي رِحَالِكُمْ ‏.‏

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also referenced under: Book 7, Hadith 660 (In-Book)