The next day - The day after his remarkable testimony that Jesus was the Son of God. This testimony of John is reported because it was the main design of this evangelist to show that Jesus was the Messiah. See the introduction. To do this, he adduces the decided and repeated testimony of John the Baptist. This was impartial evidence in the case, and hence he so particularly dwells upon it.John stood - Or was standing. This was probably apart from the multitude.
Two of his disciples - One of these was Andrew John 1:40, and it is not improbable that the other was the writer of this gospel.