It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings of Allah be upon him) said: If Allah grants someone wealth and property without him asking for it, he should accept it, because it is sustenance that Allah has sent to him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7921
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد فيه عبدالملك، فلم يتبين من هو.