A non-practicing Muslim is also liable to do Tablīgh
[In the talk “Need for Tablīgh”, Maulāna Ashraf ῾Ali Thānvi rehmatullāhi ῾alayh says]
…Let us look at an Ayah which has been used to take proof that no one should propagate dīn until he brings that action into his own life.
لِمَ تَقُولُونَ مَا لَا تَفْعَلُونَ . كَبُرَ مَقْتًا عِنْدَ اللَّهِ أَنْ تَقُولُوا مَا لَا تَفْعَلُونَ
Why do you say that which you do not do? It is most hateful to Allah that you should say that which you do not do. (61:2-3)
In reality these people have relied on the apparent translation only and have been deceived. They think that the Ayah is saying that an action which one is not doing himself, then he should not tell others to do that act, whereas that is completely incorrect. In order to understand Qurān in proper way we need to keep in mind the Asbāb un Nuzūl1 in mind.