It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that when the Prophet (peace and blessings be upon him) was in a hurry during a journey, he would perform a symbolic joining (jam‘ suri) between Maghrib and Isha prayers.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5305
Hadith Gradingحکم دارالسلام:إسناده صحيح ، خ : 2165، م : 1517 .