Silah bin Zufar (may Allah have mercy on him) said: I heard Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) saying after the prayer: 'Allahumma anta al-salam wa minka al-salam, tabarakta ya dha al-jalali wa al-ikram' (O Allah, You are the Source of peace and from You comes peace; blessed are You, O Possessor of majesty and honour). Then I prayed beside Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) and heard him also saying these same words, so I said to him: "I have heard Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) saying exactly the same words as you are saying!" At this Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) said: "The Messenger of Allah (peace and blessings be upon him) used to say these very words at the end of his prayer."
The wording of Musaddad's (may Allah have mercy on him) narration is that Amr bin Murrah (may Allah have mercy on him) said: A man prayed beside Sayyiduna Abdullah bin Umar (may Allah be pleased with them both). When he had completed his prayer, he sat and began to supplicate, and then he mentioned the same supplication. The narrator said: Then that man prayed beside Sayyiduna Abdullah bin Amr (may Allah be pleased with them both), and he too made the same supplication, so the man said to him: "This is the supplication that I heard from your brother, Sayyiduna Abdullah bin Umar (may Allah be pleased with them both)."
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / صفة الصلاة / 534
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :موقوف صحيح لذاته. » «أخرجه مصنف ابن أبي شيبة برقم: 1، 10، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 1389/2»