وَإِذَا قَرَأْتَ الْقُرْآنَ جَعَلْنَا بَيْنَكَ وَبَيْنَ الَّذِينَ لَا يُؤْمِنُونَ بِالْآخِرَةِ حِجَابًا مَّسْتُورًا 
Volume Two of Salah ad-Deen al-Ayubi discusses the establishment of the Ayubid state, mentioning the origins of Salah ad-Deen's family, his birth and childhood