وعن أبي أمامة رضي الله عنه عن النبي صلى الله عليه وآله وسلم قال : «من شفع لأخيه شفاعة فأهدى له هدية فقبلها فقد أتى بابا عظيما من أبواب الربا ». رواه أحمد وأبو داود وفي إسناده مقال.
Narrated Ibn 'Umar (RA): I heard Allah's Messenger (ﷺ) say, "If you sell anything on credit to anyone, on the condition that you will buy it back for a lower price (al-'Einah), take hold of the tails of cattle, become pleased with agriculture and give up Jihad - Allah will make disgrace prevail over you and will not remove it from you till you return to your religion." [Reported by Abu Dawud from the narration of Nafi' on the authority of Ibn 'Umar (RA), but there is a defect in its chain]. Ahmad reported something similar from the narration of 'Ata. Its narrators are reliable and Ibn al-Qattan graded it Sahih (authentic).
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
Benefit: To intercede regarding the legitimate right of a Muslim brother or to assist one another in correct matters is an Islamic legal right.
There is great reward for this in the sight of Allah.
There is no meaning in accepting a gift for such an act.
Rather, in this way, all the reward and merit is lost.
This is tantamount to opening the door to bribery.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 3541