FHA guidelines require a down payment to be made by the buyer. There are instances where you are able to be gifted the down payment.
The gift letter must be verified and signed by the person who give you the down payment. This person's bank account will be probed for seasoning (Been in this account for 3 or more month) and the amount in the account.
You would be required to pay the closing cost of this mortgage loan.
There can be no side deal that the buyer would repay this gift. This is called fraud.
If you are in a rural area there is another federal loan available for certain areas called a USDA mortgage loan. This loan is like a VA mortgage loan and require no down payment. You would be required to pay closing cost. Normally these mortgage loans are approved for a certain rural area.
You would have to check with a local mortgage lender as to if there is an area where you reside that a USDA mortgage loan would be approved.
I hope this has been of some benefit to you, good luck.