“About the case of an assignment if the assignee says to the debtor, ‘I wave in your favor what you owe me because of the assignment, one of the two Imam 5 , (abu Ja’far or abu ‘Abd Allah), ‘Alayhim al- Salam, has said, ‘If the assignee waves it in favor of the debtor he (assignee) loses the right to ask the debtor for any payment; but if he (the assignee) does not wave it in favor of the debtor, he (assignee) has the right to ask the assignor for payment . 555 Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn Hadid from Jamil from Zurarah has narrated from a similar Hadith.