Musnad Abu Ya'la al-Mawsili 150:296

Musa ibn Muhammad ibn Hayyan narrated to us, Yahya ibn Sa'id narrated to us, Kahmas narrated to us, Abdullah ibn Shaqiq narrated to us, he said: I asked Aisha, "Who was the most beloved of people to the Messenger of Allah, may Allah bless him and grant him peace?" She said, "Abu Bakr, then Umar, then Ubaydah ibn al-Jarrah."