Surah Al Mu'minun Tafseer

The Success is for the believers whose qualities are described here

Allah says:

قَدْ أَفْلَحَ الْمُوْمِنُونَ

Successful indeed are the believers,

means, they have attained victory and are blessed, for they have succeeded. These are the believers who have the following characteristics:

الَّذِينَ هُمْ فِي صَلَتِهِمْ خَاشِعُونَ