It is narrated from Hazrat Mughira (may Allah be pleased with him) that he heard the Holy Prophet (peace and blessings be upon him) say: Whoever bathes a deceased person should also perform ghusl himself.
Hadith Referenceمسند احمد / أول مسند الكوفيين / 18146
Hadith Gradingحکم دارالسلام:وقال الأئمة الكبار: لا يصح من هذا الباب شيئ