Al-A'raf 7:86 ولا تقعدوا بكل صراط توعدون وتصدون عن سبيل الله من امن به وتبغونها عوجا واذكروا اذ كنتم قليلا فكثركم وانظروا كيف كان عاقبة المفسدين ٨٦

Prophet Shu`ayb forbade his people from setting up blockades on the roads, saying,

("And sit not on every road, threatening,") threatening people with death if they do not give up their money, as they were bandits, according to As-Suddi. Ibn `Abbas, Mujahid