"Honor pursues him who tries to escape it." Moses in his humility felt that his mission as leader of the people ended with the erection of the Tabernacle, as Israel could now satisfy all their spiritual needs without his aid. But God said: "As truly as thou livest, I have for thee a far greater task than any thou hast yet accomplished, for thou shalt instruct My children about 'clean and unclean,' and shalt teach them how to offer up offerings to Me."
God hereupon called Moses to the Tabernacle, to reveal to him there the laws and teachings. Moses in his humility did not dare to enter the Tabernacle, so that God had to summon him to enter. Moses, however, could not enter the sanctuary while a cloud was upon it, this being a sign "that the demons held sway," but waited until the cloud had moved on. The voice that called Moses came from heaven in the form of a tube of fire and rested over the two Cherubim, whence Moses perceived its sound.
This voice was a powerful as at the revelation at Sinai when the souls of all Israel escaped in terror, still it was audible to none but Moses. Not even the angels heard it, for the words of God were destined exclusively for Moses. Aaron, too, with the exception of three cases in which God revealed Himself to him, never received His commands except through the communications of Moses. God would call Moses twice caressingly words by name, and when he had answered, "Here am I," God's words were revealed to him, and every commandment as a special revelation.
God always allowed a pause to take place between the different laws to be imparted, that Moses might have time rightly to grasp what was told him.