John the Apostle
John 14:20BSB·traditional attribution

On that day you will know that I am in My Father, and you are in Me, and I am in you.

Matthew Henry Presbyterian

Though I leave you bodily, I leave you not comfortless; departure is neither total nor final. I come to you at my resurrection, come daily in my Spirit's tokens and visits, and come certainly at the end. The Lord is at hand: this should quiet your sorrow.

AI summary

Commenting on John 14:18-24

Jamieson-Fausset-Brown Reformed

At that day--of the Spirit's coming. ye shall know that I am in my Father, ye in me, I in you--(See on Joh 17:22-23).

Geneva Bible Notes Reformed

At that day ye shall know that I [am] in my Father, and ye in me, and I in you. (i) The Son is in the Father in such a way that he is of one selfsame substance with the Father, but he is in his disciples in a different way, as an aider and helper of them.