Elon Musk privately told some of the bankers who lent him $13 billion to fund his leveraged buyout of Twitter that they would not lose any money on the deal, according to five people familiar with the matter.

The verbal guarantees were made by Musk to banks as a way to reassure the lenders as the value of the social media site, now rebranded as X, fell sharply after he completed the acquisition last year.

Despite the assurances, the seven banks that lent money to the billionaire for his buyout—Morgan Stanley, Bank of America, Barclays, MUFG, BNP Paribas, Mizuho and Société Générale—are facing serious losses on the debt if and when they eventually sell it.