Musnad Ahmad 27:1246

Abu Amir narrated to us, Kharijah ibn Abdullah al-Ansari narrated to us, from Nafi’, from Ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "O Allah, strengthen Islam with the one of these two men who is most beloved to You: Abu Jahl or Umar ibn al-Khattab." And the more beloved of the two to Allah was Umar ibn al-Khattab.