It is narrated from Hazrat Abu Umamah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever intercedes for someone and the one for whom the intercession is made presents him with a gift, which he accepts, then he has entered through one of the great doors of usury.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22251
Hadith Gradingحکم دارالسلام:ضعيف، ابن لهيعة سيئ الحفظ، لكنه متابع، والقاسم بن عبدالرحمن له أفرادات، وهذا منها