In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Responding to this question, Dr. `Abdul-Fattah Idrees, Professor of Comparative Jurisprudence at Al-Azhar University, says:
A pious Muslim has always to be cautious about the sources of his earnings. Unlawful earnings invoke the wrath of Almighty Allah and endangers the Muslim’s life in the Hereafter as he will be held accountable for such gains. The amount of lawful jobs are surely more than those that are unlawful.
A Muslim has to exert effort in looking for a permissible job and Almighty Allah will help him in this regard.
As you did not know the prohibition of working in such places, you are allowed to make use of the money you gained during this period because you exerted effort in return for this money without knowing the prohibition of its source.
Therefore, it is permissible for you to spend it on your preparation for marriage and such lawful purposes.
However, you are not allowed to take money from your father because you know that the source of his money is prohibited. You should even advise him to quit this unlawful job so as to cleanse and purify the source of his provision.
For sure there are many other sources of lawful earnings. Insisting on working in the field of tourism is not an excuse for transgressing the limits of Almighty Allah. You and your father can look for any other job, even if it is outside that field, which, as you have mentioned, is difficult for you to observe the injunctions of your religion when working in it.
Almighty Allah knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.