Exodus 24:13

And Moses rose up, and his minister Joshua: and Moses went up into the mount of God.

Moses rose up with Joshua, his servant, and Moses went up onto God's Mountain.

And Moses rose up, and Joshua his minister: and Moses went up into the mount of God.

And Moses riseth -- Joshua his minister also -- and Moses goeth up unto the mount of God;

So Moses set out with Joshua his attendant and went up on the mountain of God.