Ether 6:2

For it came to pass after that the Lord had prepared the stones which the brother of Jared had carried up into the mount, the brother of Jared came down out of the mount, and he did put forth the stones into the vessels which were prepared, one in each end thereof; and behold, they did give light unto the vessels thereof.

After the Lord prepared the stones that the brother of Jared had carried up the mountain, the brother of Jared came down. He put the stones into the boats. He put one stone in each end. The stones gave light to the boats.

After the Lord prepared the stones that the brother of Jared had carried up the mountain, he came back down and placed the stones into the vessels—one at each end. And just like that, they glowed with light.