Exodus 24:14-16

Young's Literal Translation

¹⁴ and unto the elders he hath said, `Abide ye for us in this [place], until that we turn back unto you, and lo, Aaron and Hur [are] with you -- he who hath matters doth come nigh unto them.'

¹⁵ And Moses goeth up unto the mount, and the cloud covereth the mount;

¹⁶ and the honour of Jehovah doth tabernacle on mount Sinai, and the cloud covereth it six days, and He calleth unto Moses on the seventh day from the midst of the cloud.