Question: The questioner says: his knowledge is little and he hopes to be a caller to Allah but he is afraid he will make a mistake. What should he do?
Answer: “If he wants to be a caller to Allah, he only calls to what he knows. He does not unnecessarily burden himself to speak about what he does not know. That is not allowed for him to teach something he does not know. He only teaches what he knows with certainty and he will become a caller to Allah. The Prophet (ﷺ) said:
بلغوا عني ولو آية
Convey from me even an Ayah of the Qur’an
[Bukhari and Muslim]
So if a person teaches his brother surahul-Fatiha, he becomes from the callers to Allah or if he teaches the meaning of La ila illa Allah Muhammadur-Rasul Allah he is a caller to Allah. Everyone according to his ability”.
Faisal Ibn Abdul Qaadir Ibn Hassan