It is narrated, most likely as marfu’, from Hazrat Aiz (may Allah be pleased with him) that whoever receives something from his sustenance without asking for it, he should accept it.
Hadith Referenceمسند احمد / أول مسند البصريين / 20649
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد منقطع، عامر الأحول لم يدرك عائذا