Money received FROM a 501c3

A gift received is not reported on a tax return, regardless of the amount received.

If it is a gift then it is not taxable and not reportable on your tax return.

As others have said, if it is a gift, then it is not considered income to you.

Where you have to be careful is if you made a donation to the 501c3, and wanted to deduct that as a charitable donation, you would first need to subtract the amount of the 501c3's gift to you