2CH 35:3

3 And said unto the Levi'im that taught kol Yisroel, which were hakedoshim unto Hashem, Put the Aron HaKodesh in the Beis which Sh'lomo Ben Dovid Melech Yisroel did build; it shall not be a massa [(burden, something carried)] upon your ketefayim [(shoulders)]; serve now Hashem Eloheichem and His people Yisroel,