Musnad Ahmad 1153:1745

Waki’ narrated to us, he said: My father narrated to us, from Ash’ath ibn Abi al-Sha’tha’, from his father, from Masruq, from ‘Aishah, that the Prophet, peace and blessings of Allah be upon him, used to: "Love starting with the right in ablution, in combing the hair, and in putting on sandals." And Waki’ said: Once, "putting on sandals."