Hawzah News Agency - Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Mahbub from Ali ibn abu Hamza who has said the following. “(Imam) abu al-Hassan Musa ibn Ja’far has said,

إِذَا مَاتَ الْمُؤْمِنُ بَكَتْ عَلَيْهِ الْمَلائِكَةُ وَبِقَاعُ الارْضِ الَّتِي كَانَ يَعْبُدُ الله عَلَيْهَا وَأَبْوَابُ السَّمَاءِ الَّتِي كَانَ يُصْعَدُ فِيهَا بِأَعْمَالِهِ وَثُلِمَ فِي الاسْلامِ ثُلْمَةٌ لا يَسُدُّهَا شَيْ‏ءٌ لانَّ الْمُؤْمِنِينَ الْفُقَهَاءَ حُصُونُ الاسْلامِ كَحِصْنِ سُورِ الْمَدِينَةِ لَهَا.

‘When a true believer dies the angels and the parts of earth where he worshipped Allah weep because of his death. Also, the doors of the heavens through which his good deeds had been taken up weep and it causes irreparable damage in the Islamic system. It is because the true believing Fuqaha, people of proper understanding in the religion and its laws are the strongholds of the Islamic system just as the fortress around a city is a stronghold for it.’”

Al-Kāfi, v.1, Book 2, Chapter 7