i think you think vs CPF FAQ:
https://www.cpf.gov.sg/members/schemes/schemes/housing/housing-scheme#Item1631
If you have used your CPF savings to finance your property, you will have to refund the following to your CPF account:
* the principal CPF amount (
P) which you have withdrawn for the property; and
* (the accrued interest (
I) which you would have earned if the savings were not withdrawn from your CPF account.
...
If you are 55 years old and above:
* You will also need to refund the pledged amount on top of the
P and
I if you had pledged to refund an amount withdrawn from your Retirement Account (RA) savings in cash;
* The amount refunded to your CPF account will be used to meet your retirement savings up to the Full Retirement Sum (FRS) in your RA. Thereafter, any balance will be paid to you in cash within 1 week from the time the refunds are credited to your CPF account;
...