Musa bin Uqbah (may Allah have mercy on him) narrates about Umar bin Abd al-Aziz (may Allah have mercy on him) that when it rained he would combine Maghrib and Isha. Sa'id bin al-Musayyib (may Allah have mercy on him), Urwah bin al-Zubayr (may Allah have mercy on him), Abu Bakr bin Abd al-Rahman (may Allah have mercy on him) and others would also pray with them, and they did not object to it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5558