Theophylact of Ohrid
Catena Aurea · Johannesevangelium 1
And they which were sent were of the Pharisees. And they asked him, and said unto him, Why baptizest thou then, if thou he not that Christ, nor Elias, neither that prophet? John answered them, saying, I baptize with water: but there standeth one among you, whom ye know not; He it is, who coming after me is preferred before me, whose shoe’s latchet I am not worthy to unloose. These things were done in Bethabara beyond Jordan, where John was baptizing.
(in loc.) Or it was, that our Lord was in the midst of the Pharisees; and they not knowing Him. For they thought that they knew the Scriptures, and therefore, inasmuch as our Lord was pointed out there, He was in the midst of them, i. e. in their hearts. But they knew Him not, inasmuch as they understood not the Scriptures. Or take another interpretation. He was in the midst of them, as mediator between God and man, wishing to bring them, the Pharisees, to God. But they knew Him not.