Maymun bin Mihran (may Allah have mercy on him) narrates that I heard Sayyiduna Ibn Umar (may Allah be pleased with them both) saying: "I remember the time when we were at Fajj al-Rawha', on the occasion of a military expedition in which the Messenger of Allah (peace and blessings be upon him) went out, and Sayyiduna Umar (may Allah be pleased with him) saw me and made several supplications for me; in exchange for those supplications, even the whole world and all that is in it would not please me."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Maymun only with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 5387
Hadith Gradingمحدثین:فيه موسى بن عمر بن عمرو بن ميمون بن مهران لم يُعرف، وبقية رجاله ثقات
Hadith Takhrij«قال الهيثمي: فيه موسى بن عمر بن عمرو بن ميمون بن مهران ولم أعرفه وبقية رجاله ثقات «مجمع الزوائد ومنبع الفوائد، ج 9، ص 346»»