I found 50 riyals about two months ago on one of the sidewalks. What should I do with them?

Question:
I found fifty riyals about two months ago on one of the sidewalks. What should I do with them, especially since no one sits in the place where I found them? Should I give them in charity, or should I treat them as if they were my own money, especially since I have a pressing need for money?

Answer:
The Prophet (peace and blessings be upon him) established limits and regulations for lost property. If a person finds it, he must identify it by its distinguishing marks and know its characteristics. Then he must announce it by calling out in the gathering places and locations where its owner is likely to be, once a week, then once a month, until a full year has passed. If a year passes and no one comes forward, he may take possession of it. If someone comes to him during that year and describes its characteristics exactly, he must hand it over to him. This is the obligatory ruling regarding lost property. The matter of lost property is not trivial; a person should not take lost property unless he commits to its Islamic legal ruling.