Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) said to Sayyiduna Abbas (may Allah be pleased with him): Accept Islam. By Allah, your accepting Islam would be dearer to me than if (my father) al-Khattab were to become a Muslim, and the only reason for this is that it is dearer to the Prophet (peace and blessings be upon him). So accept Islam, and in this way you will have precedence.
Al-Bazzar recorded it; its chain contains Abd al-Aziz bin Aban, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15468