Do not sit in ambush on every road to threaten people and hinder from the Way of Allah those who believe in Him, seeking to make His Way crooked. Remember how He multiplied you when you were a few in number and see what was the end of the mischief-makers of prior nations.
Meaning:-
Ambush: an act or instance of lying concealed so as to attack by surprise, a surprise attack by people lying in wait in a concealed position.
Hinder: create difficulties for (someone or something), resulting in delay or obstruction.
Crooked: not straight; dishonest and likely to do illegal things, a dishonest person.