Al-Hassan ibn Muhammad has narrated from Ahmad ibn Ishaq from Su'dan ibn Muslim from Mu'awiyah ibn 'Ammar who has said the following:
"Once I asked (Imam) abu 'Abd Allah, Alayhi al-Salam, 'There is a man who recounts your Hadith and spreads them among people and ties them to their hearts and the hearts of your followers. Also there is a worshipper among your followers who does not narrate your Hadith. Which of these two people is better?' The Imam replied, 'The one who narrates our Hadith and ties them up to the hearts of our followers is better than one thousand worshippers.'"
(Al-Kafi, Volume 1, Hadith 52)