It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: If Allah grants someone some wealth and property without him asking for it, then he should accept it, because this is sustenance that Allah has sent to him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8294
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد فيه عبدالملك فلم نتبين من هو