Comparing Traveling for Da'wah and Attending the Course

Question:
This person asks Your Eminence, the father: Which is better, traveling with the Chadian brothers for the sake of da'wah and teaching the people in Chad the correct creed, or attending this course held in this mosque, given that the brothers' travel will take place before the end of this course?

Answer:
If the traveler has knowledge that enables him to teach people, that is better; he teaches the people. But if he does not have such knowledge, he should not travel; he should attend the course or whatever else is available and benefit from it. However, if he is among the people of knowledge and insight, capable of teaching people and sending them out, there is no harm in his traveling, for Allah the Exalted has commanded calling others to Islam, and Allah says, and people are in need of the call. If he has knowledge and insight and travels for this purpose to a country where he does not fear for his own safety or his religion,