Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) looked at the Ka'bah and said: "There is none worthy of worship except Allah! How pure you are, how pleasant your fragrance is, and how great your sanctity is! Yet the sanctity of a believer is greater than yours. Indeed, Allah, the Mighty and Majestic, has made you sacred, and He has made the wealth, the blood and the honour of a believer sacred, and also that an evil assumption be held about him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10920