I learned this dua from the lecture of Hazrath Moulana Syed Anzarshah Qasmi Sahab(DB). He said that Hazrath Moulana Abrar-ul-Haq Sahab taught this dua i.e. whenever evil person or any person who comes with a intention to harm you or do zulm on you, for example, if any police constable is coming near you with the intention to doing zulm (without any valid reason) then we should read this 4 beautiful names of Allah repeatedly يا ودود (Ya Waduudu) يا قدوس (Ya Quddusu) يا غفور (Ya Gafuuru) يا صبو ح(Ya subbuhu) This is a dua which will save you from their zulm. P.S: Yaqeen should be there.