'Ark of the Testimony' in the Bible

When the camp moves forward, Aaron shall go in, and his sons, and they shall take down the veil of the screen, and cover the ark of the Testimony with it,

When Moses went into the Tent of Meeting to speak with Yahweh, he heard his voice speaking to him from above the mercy seat that was on the ark of the Testimony, from between the two cherubim: and he spoke to him.