Can the Maghrib prayer be combined with the Isha prayer?

Maghrib prayer can be combined with 'Isha prayer by delaying it (jama' ta'khir) when there is a legitimate شرعي excuse, and 'Isha prayer can be combined with Maghrib prayer by advancing it (jama' taqdim). Maghrib prayer is prayed as three rak'ahs during travel and is not shortened. The Sunnah has indicated the permissibility of combining Maghrib and 'Isha prayers during travel, as well as on a rainy night.