An explanation to the Du'a of Yunus. The Dua of Dhun-Nun (Yunus) by which he invoked Allah from within the belly of the whale was,

 لَّا إِلَٰهَ إِلَّا أَنتَ سُبْحَانَكَ إِنِّي كُنتُ مِنَ الظَّالِمِينَ 
 

"There is none worthy of worship except You. You are pure. Verily I am amongst the oppressors". [al-Anbiya 21:87] 

The Prophet (صلى الله عليه وسلم) said about the Invocation of Yunus 'None who is experiencing difficulty employs it except that Allah would relieve him of his difficulty' Shaikh ul Islam Ibn Taymiyyah was asked about the dua of yunus and He answers it in the form of this Book. Among the Questions answered include. What is the Meaning of this Dua? Are their any unstated connection between belief in the heart and the meaning of this Supplication? What are the connection between belief in the heart and the meaning of this Supplication such that it leads to the removal of difficulty? What are the Conditions, the Method and many more Questions are answered.