I was reading a (poorly written) essay recently, wherein a hadith was mentioned but not fully quoted. Allegedly, the classical fuqaha used it to forbid bay' al-kali bil-kali (Selling of debts for debts).

Beyond that, all I know is that it was reported by Ibn 'Umar, as related by al-Tabrani (sic).

What is this hadith?

I was reading a (poorly written) essay recently, wherein a hadith was mentioned but not fully quoted. Allegedly, the classical fuqaha used it to forbid bay' al-kali bil-kali (Selling of debts for debts).

Beyond that, all I know is that it was reported by Ibn 'Umar, as related by al-Tabrani (sic).

What does this hadith say, and how authentic is it?