Muwatta
Malik
موطأ مالك
09
Shortening the Prayer
كتاب قصر الصلاة فى السفر
Chapter 1: Joining Two Prayers when Settled and when Travelling
Muwatta Malik 335
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to join the prayer along with the amirs if they joined Maghrib and Isha in the rain.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا جَمَعَ الأُمَرَاءُ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ فِي الْمَطَرِ جَمَعَ مَعَهُمْ .