Musnad Abu Ya'la al-Mawsili 147:2

Nasr ibn Ali narrated to us, Uwayd ibn Abi Imran narrated to us, from his father, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said to me: "O Anas, perform the ablution perfectly, and your lifespan will be increased. Greet whomever you meet from my nation, and your good deeds will increase. And when you enter your house, greet whoever you meet from your household, and the goodness of your house will increase. And pray the Duha prayer, for it is the prayer of the penitent before you." And he said: "O Anas, show mercy to the young, honor the old, and you will be among my companions."