Allah (swt) says in Sura Al Asr:
By (the Token of) Time (through the ages),
إِنَّ الْإِنْسَانَ لَفِي خُسْرٍ [١٠٣:٢]
Verily Man is in loss,
إِلَّا الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ وَتَوَاصَوْا بِالْحَقِّ وَتَوَاصَوْا بِالصَّبْرِ [١٠٣:٣]
Except those who believe, and do righteous deeds, and (join together) in the mutual teaching of Truth, and of Patience and Constancy.
The Question comes... Believe in What? The following Ayah of Holy Quran answers the question:
فَآمِنُوا بِاللَّهِ وَرَسُولِهِ وَالنُّورِ الَّذِي أَنْزَلْنَا ۚ وَاللَّهُ بِمَا تَعْمَلُونَ خَبِيرٌ [٦٤:٨]
Believe, therefore, in Allah and His Messenger, and in the Light which we have sent down. And Allah is well acquainted with all that ye do. [64:8]
The Following Hadees of Imam Musa Kazim (as) Endorses the above truth that the Ahlul Bait (as) are NOT Humans and have only come in Human form for the guidance of Human beings :
Imam Musa Kazim (as) while taking about Meraj and referring to Prophet Muhammad (saww) and Imam Ali (as) says:
ظاهر هما بشریة و باطنهما لا هوتیه ظهرا الخلق علی هیاكل الناسوتیة حتی یطیقوا روتیها
“These 2 are apparently (Externally) Human and their Batin (internal) is related to Allah (swt). They have come amongst people in their form (appearance) so that people can see them."
Imam Musa Kazim (as) continues saying that this has been mentioned in the following verse of the Holy Quran:
وَلَوْ جَعَلْنَاهُ مَلَكًا لَجَعَلْنَاهُ رَجُلًا وَلَلَبَسْنَا عَلَيْهِمْ مَا يَلْبِسُونَ [٦:٩]
If we had made it an angel, We should have sent him as a man, and We should certainly have dressed them the way they are dressed up.
Source: Bihar Al Anwar Vol.35 H.24, Tafseer-e-Burhaan Vol.3 H.7, Taawil-al-Ayat Vol.1 Pg:398