It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) supplicated: "O Allah! Strengthen Islam through Umar bin al-Khattab or through Abu Jahl bin Hisham." Abu Kurayb added in his narration that the next morning Umar (may Allah be pleased with him) came to the Messenger of Allah (peace and blessings be upon him) and accepted Islam that very day. Abu Kurayb narrated (the words of the supplication) in his narration as: "O Allah! Honour Islam."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11607