And when Moses was gone into the tabernacle of the congregation to speak with him, then he heard the voice of one speaking unto him from off the mercy seat that was upon the ark of testimony, from between the two cherubims: and he spake unto him.
When Moses went inside the tent to talk with God, he heard a voice talking to him from above the seat on the box with important writings, between two angel-like creatures. God then spoke to Moses.