I should be clear, since the quote might be taken out of context due to the bolding.

I would tell them that if they can't pay, it's perfectly fine. In addition, I'd give them a deadline before I would relist. Looking at it now, it might seem a little pushy to give a deadline but this would only happen if they hadn't contacted me after the initial message to ask if everything is alright re: payment. I've done this with a buyer and it all worked out.