Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: The Prophet (peace and blessings be upon him) said: "It is not permissible to cause harm, nor to repay harm with harm. A man has the right to place a beam on his neighbour's wall. And when you are in doubt about (the width of) a road, make it seven cubits."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11756