Bible Verses About Union With Christ: Includes union with the Father

that they all may be one, as Thou Father art in me, and I in Thee; that they also in us may be one, that the world may believe that Thou didst send me.

Ye, then, that which ye heard from the beginning, in you let it remain; if in you may remain that which from the beginning ye did hear, ye also in the Son and in the Father shall remain,