Striving for Sustenance is Legislated Struggle

Question :

I am twenty-five years old and I adhere to the orders of Allâh. My brothers and I are orphans and we used to live solely on the charity of others. Then I went for Jihad in Afghanistan for three years. When I returned, I started to work, but I found no desire to work and observe the rules of others. Am I sinning if I don't work? Can I take from my brothers' income and spend from it by inviting over friends?

Answer:

You must strive and toil for your sustenance, for yourself and for your brothers if they are incapable of doing so themselves. In a Hadith the Messenger of Allah ﷺ said:
"The one who strives to give to the widow and the poor is like the Mujahid in the path of Allah."

And in another narration:
"Like the one who is fasting without breaking his fast, or the one who stands for prayer without weakening."

It is not allowed for you to take money from your brothers to sustain yourself and your guests unless you are really incapable of working or if your older and wiser brothers have given you permission to do so.

Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 7 Pages 359-360