The inner aspect of religion is “iman” (belief). As per its details mentioned in the Qur’an, this inner aspect also consists of five things:

 

1. Belief in God

2. Belief in the Angels

3. Belief in the Prophets

4. Belief in Divine Books

5. Belief in the Day of Judgement

 

The Qur’an says:

 

آمَنَ الرَّسُولُ بِمَا أُنزِلَ إِلَيْهِ مِن رَّبِّهِ وَالْمُؤْمِنُونَ كُلٌّ آمَنَ بِاللّهِ وَمَلآئِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ لاَ نُفَرِّقُ بَيْنَ أَحَدٍ مِّن رُّسُلِهِ وَقَالُواْ سَمِعْنَا وَأَطَعْنَا غُفْرَانَكَ رَبَّنَا وَإِلَيْكَ الْمَصِيرُ  (2 : 285)

The Messenger has believed in what has been revealed to him by His Lord, and so do those who follow [him]. All of them professed faith in God and His angels and His books and His messengers. [They affirm:] “We do not discriminate between any of God’s messengers,” and they said: “We heard and have obeyed. Lord! We seek Your forgiveness, and [believe that on the Day of Judgment] to You shall we return.”(2:285)

 

The Prophet (sws) while including a corollary of belief in Allah – the good and evil of fate ordained by God – has referred to this set of beliefs in the following manner:

 

اَلْإِيْمَان: أَنْ تُؤْمِنَ بِاللهِ وَمَلَائِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ وَالْيَوْمِ الْآخِرِ وَتُؤْمِنَ بِالْقَدْرِ خَيْرِهِ وَشَرِّهِ

Imanis that you believe in God and His Angels and His Books and His Messengers and the Hereafter and the good and evil fate [ordained by your God].[1]

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[1]. Ibid., 22, (no. 93).