Musnad Ahmad 26:423

Yahya ibn Adam and Husayn ibn Muhammad narrated to us, they said: Isra'il narrated to us, from Abu Ishaq, from Abu al-Ahwas and Abu 'Ubaydah, from 'Abdullah, who said: I asked the Messenger of Allah, peace and blessings of Allah be upon him, "Which deeds are best?" He said: "Prayer at its time, honoring one's parents, and Jihad in the way of Allah." And if I had asked him for more, he would have given me more. Husayn said: "And if I had asked him for more, he would have given me more."