John Gill Commentary John 16:19

"Jesus perceived that they were desirous to ask him, and he said unto them, Do ye inquire among yourselves concerning this, that I said, A little while, and ye behold me not, and again a little while, and ye shall see me?" — John 16:19 (ASV)

Now Jesus knew that they were desirous to ask him
This is a proof of Christ's deity, that he is the omniscient God who knows all things, what is in man, even the secrets of the heart; for he only knew the whisperings of the disciples, and their inquiries among themselves about the sense of his words, but also their secret desires to ask him concerning it:

and said unto them, do you inquire among yourselves of that I said, a
little while and you shall not see me, and again a little while and you
shall see me ?
which he said before they could put the question to him, they being bashful, and backward, through fear or shame; and which not only confirms what is before observed of his omniscience, but also shows his readiness to open his mind and meaning, and explain himself to his disciples, as he does in the following words.