Musnad Abu Ya'la al-Mawsili 209:114

Abu Khaythama narrated to us, Ismail bin Ibrahim narrated to us, from Ibn Jurayj, from Ibn Abi Mulayka, who said: Umm Salama said: "The Messenger of Allah (peace and blessings of Allah be upon him) was more hastening for the Dhuhr (prayer) than you are, and you are more hastening for the Asr (prayer) than he was."