Ethical philosopher Peter Singer presents and expands on the following argument in his book:[1]
"First Premise: Suffering and death from lack of food, shelter and medical care are bad.
Second Premise: If it is in your power to prevent something bad from happening, without sacrificing anything nearly as important, it is wrong not to do so.
Third Premise: By donating to aid agencies, you can prevent suffering and death from lack of food, shelter and medical care, without sacrificing anything nearly as important.
Conclusion: Therefore, if you do not donate to aid agencies, you are doing something wrong."
[1] https://www.thelifeyoucansave.org/the-book/
They bought back the publishing rights, so it is freely downloadable.
"First Premise: Suffering and death from lack of food, shelter and medical care are bad.
Second Premise: If it is in your power to prevent something bad from happening, without sacrificing anything nearly as important, it is wrong not to do so.
Third Premise: By donating to aid agencies, you can prevent suffering and death from lack of food, shelter and medical care, without sacrificing anything nearly as important.
Conclusion: Therefore, if you do not donate to aid agencies, you are doing something wrong."
[1] https://www.thelifeyoucansave.org/the-book/
They bought back the publishing rights, so it is freely downloadable.