The ruling on the travel of one who has a debt for Hajj and da'wah

Question:
A man has a debt. Is it permissible for him to travel abroad to learn a foreign language for the sake of calling people to Allah, or is it said: This is more deserving of prohibition than prohibiting one who has a debt from performing Hajj?

Answer:
If this travel harms the creditors, he does not travel; he starts with the debt. But if it does not harm the creditors—such as if he has no job and has not found work, and perhaps he will learn this thing so that he can get employed, pay off his debt, and benefit the Muslims—then it is different. But if he has a job and is able to pay off the debt and cover what is due from him, he does not travel.
Q: But is the prohibition of one who has a debt from Hajj due to fear...?
A: He is prohibited from Hajj if his travel harms the creditors. But if it does not harm the creditors—such as if he travels with people and the expenses are borne by someone else—he is not prohibited; because his Hajj does not harm them.