Philo Judaeus De Ebrietate 135

[135] but the tabernacle and all things that are therein are invisible, not only because these are placed in the innermost recesses and in the most holy shrines, but also because God has affixed according to the injunctions of the law, the inevitable punishment of death, not only to any one who touches them, but to any one who through the superfluous curiosity of his eyes beholds them. The only exception is, if any one is perfect and faultless, unpolluted by any error whether it be great or small, having a nature entirely even and full, and in all respects most perfect;