It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every building is a burden upon its owner except what is like this," and he (peace and blessings be upon him) gestured with his hand, "and all knowledge is a burden upon its bearer on the Day of Resurrection except knowledge that is acted upon."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18351