Rev 21:5-6
5 And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful.
6 And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
KJV
I believe that we've gone over verse 5, but, verse 6... what is the water of life? We will not need the water of life once we are in heaven. But to have ever lasting life, we now must partake of it....