English Translation
Narrated 'Asim: I said to Anas, "Did Allah's Apostle make Medina a sanctuary?" He replied, "Yes, (Medina is a sanctuary from suchand-such place to such-and-such place. It is forbidden to cut its trees, and whoever innovates an heresy in it or commits a sin therein, will incur the curse of Allah, the angels, and all the people." Then Musa bin Anas told me that Anas added, "..... or gives refuge to such an heretic or a sinner..."
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.