Ibn Umar prayed Maghrib and Isha at Jam with a single iqamah.Abdullah bin Malik said to him, "Abu Abdul-Rahman, what is this prayer?"He replied, "I prayed it with the Messenger of Allah ﷺ in this very place with a single iqamah."
حدثنا يحيى عن سفيان حدثني أبو إسحاق
أن ابن عمر صلى المغرب والعشاء بجمع بإقامة واحدة فقال له عبد الله بن مالك يا أبا عبد الرحمن ما هذه الصلاة فقال صليتها مع رسول الله ﷺ في هذا المكان بإقامة واحدة
Its isnad is sahih. Abdullah bin Malik bin Harith Hamdani is thiqah. Ibn Hibban mentioned him among the thiqat, and this hadith is the only one he has in the six books, found in Abu Dawud and Tirmidhi. The hadith carries the same meaning as 4452 and 4460. We have already pointed out this isnad at 4452 and mentioned what Tirmidhi and others said about it.