Shurayh bin Ubayd narrates: Sayyiduna Utbah (may Allah be pleased with him) used to say: Irbad is better than me. And Sayyiduna Irbad (may Allah be pleased with him) used to say: Utbah is better than me; he came to the Prophet (peace and blessings be upon him) one year before me.
Imam Ahmad recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16016