The neighbour material in the hadith corpus is extensive and specific, and it does not ask about the neighbour's religion. Jibril kept counselling the Prophet about the neighbour until he thought they would inherit; a man whose neighbour is not safe from him is not a believer; when you make soup, add water and give some to your neighbour. Classical jurists went as far as defining the radius — forty houses in every direction, in the widest opinion — and gave neighbours a pre-emption right over the sale of adjoining property in Hanafi law, which is a legal remedy rather than a pious wish. Muslim migration has tested this hard. The neighbourly density of a Cairo or Lahore street does not survive an apartment building in Toronto, and Muslim writers about the diaspora return to this loss constantly. Mosque open-day programmes and neighbourhood iftars are, in part, a deliberate attempt to rebuild the thing.