Hawzah News Agency – Imam al-Baqir peace be upon him says:

المؤمنُ أصْلَبُ مِن الجَبلِ، الجَبلُ يُسْتَقَلُّ مِنه، والمؤمنُ لا يُسْتَقَلُّ مِن دِينِه شَي‏ءٌ.

'The believer is harder than a mountain, for the mountain is dispensable whereas nothing can be taken away from his religion.'

Source: al-Kafi, v. 1, p. 241, no. 37