"prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto Myself; that where I am, there ye may be also.’ John 14:1-3 . It is these mansions that I am looking to; it is not the earthly mansions here, for erelong they are to be shaken down by the mighty earthquake; but those heavenly mansions that Christ has gone to prepare for the faithful. LS 293.3"
"Let not your heart be troubled: ye believe in God, believe also in me. In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also."
Ellen White directly references John 14:1-3 in this passage.