بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيم
The Prophet MuHammad Salla l-Lahou ^alaihi wa Sallam, said:-
بني الإسلام على خمس : شهادة أن لا إله إلا الله ، وأن محمدا رسول الله ، وإقام الصلاة ، وإيتاء الزكاة ، وحج البيت ، وصوم رمضان
Which means:- "The greatest matters of Islâm are five:
1. Testifying that no one is God except Allâh and that MuHammad is the Messenger of Allâh (Belief)
2. Performing Salâh (Prayer)
3. Giving Zakâh
4. Performing Hajj (Pilgrimage)
5. Fasting RamaDan."
Related by Imâm Muslim
The most important among these five is the belief.
The Prophet MuHammad Salla l-Lahou ^alaihi wa Sallam, said:
« اْلإِيمَانُ أَنْ تُؤْمِنَ بِاللهِ وَمَلاَئِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ وَالْيَوْمِ الاخِرِ وَتُؤْمِنَ بِالْقَدَرِ خَيْرِهِ وَشَرِّهِ »
Which means: « Belief is to believe in Allâh, His angels, His Books, His messengers, the Day of Judgment, and to believe in the Qadar (destiny), both the good and the evil. » [Related by Muslim]