Calling (to Islam)
.فِي كِتَابِ أَمِيرِ الْمُؤْمِنِينَ ع إِلَى أَهْلِ مِصْرَ فِي وَصْفِ النَّارِ قَعْرُهَا بَعِيدٌ وَ حَرُّهَا شَدِيدٌ وَ شَرَابُهَا صَدِيدٌ وَ عَذَابُهَا جَدِيدٌ وَ مَقَامِعُهَا حَدِيدٌ لَا يَفْتُرُ عَذَابُهَا وَ لَا يَمُوتُ سَاكِنُهَا دَارٌ لَيْسَ فِيهَا رَحْمَةٌ وَ لَا تَسْمَعُ لِأَهْلِهَا دَعْوَةٌ
In a letter of Amir Al-Momineen-asws to the people of Egypt in description of the Fire, ‘Its bottom is remote, and its heat is severe, and its drink is pus, and its Punishment is renewed, and its rods are of iron. Neither does its Punishment have a break, nor would its dwellers be dying. It is a house wherein isn’t any mercy, nor would a ‘دَعْوَةٌ ’ call of its people be heard’.[1]
Rasool Allah-saww invited Al-Najashy (King of Najash) to Islam, i.e.,
فَوَافَوُا الْمَدِينَةَ وَ دَعَاهُمْ رَسُولُ اللَّهِ ص إِلَى الْإِسْلَامِ فَآمَنُوا وَ رَجَعُوا إِلَى النَّجَاشِي
‘They (a delegate of king Al-Najshy) arrived at Al-Medina, and Rasool-Allah-saww invited them to Islam. They believed and returned to Al-Najashy (an extract).[2]
NB: Tabligh (Preaching) | Hubeali.com
[1] Bihar Al-Anwaar – V 8, The book of Justice, S 3, Ch 24 H 16
[2] Bihar Al-Anwaar – V 18, The book of our Prophet-saww, P 3 Ch 4 H 5