It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Allah has made the truth flow upon Umar's tongue and heart."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5145
Hadith Gradingحکم دارالسلام:حديث صحيح ، وهذا إسناد جيد .