Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) once mentioned the following:

The zikr of Allah Ta‘ala is like a fortress which protects one from the evil of the shayaateen. Hence, whenever one goes to a town or city for tableegh, then apart from propagating deen, one should also engage in zikr. In proportion to the evil of the environment, one should increase his zikr so that he may remain safe from the evil influences of shayaateen, jinn and people. (Malfoozaat Hazrat Moulana Muhammad Ilyaas (rahmatullahi ‘alaih) pg. 52)

Source: Ihyaauddeen.co.za