It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) was never as eager for anything as he was for the two rak'ahs before Fajr.
Hadith Referenceمسند احمد / مسند النساء / 26165
Hadith Gradingحکم دارالسلام:إسناده ضعيف الضعف حكيم بن جبير