مُسْنَدُ أَحْمَدَ
Musnad Ahmad 4215
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah said: I said: O Messenger of Allah, which deed is best? He said: Prayer offered on time. I said: Then what? He said: Honouring one's parents. I said Then what? He said: Jihad for the sake of Allah. And if I had asked for more he would have given me more.
Musnad Ahmad 4243Its isnad is saheeh, al-Bukhari (527) and Muslim (85)]