Acts 1:9-11 (KJV) And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight.
And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel;
Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.

Mark 16:19-20 (KJV) So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God.
And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.

This quote is by Ellen White
Desire of Ages
Page 832
Ascended but returning again

Christ had ascended to heaven in the form of humanity. The disciples had beheld the cloud receive Him.... And the angles had assured them that the very One whom they had seen go up into heaven, would come again even as He had ascended.... Well might the disciples rejoice in the hope of their Lord's return.