Matthew Poole and continuators on John 3:23

23 ¶ And John also was baptizing in Aenon, near to Salim, because there was much water there : and they came, and were baptized .

Aenon is here said to be near Salim; it was the Name of a City, as some think; others say, River or Brook near that City; neither the River, nor the City, are elsewhere mentioned in Scripture: but Topographers place it on the Eastern part of the Lot of Manasses, not far from Bethshan or Scythopolis

there Iohn was Baptizing; because this Aenon was a Brook or River that had much Water, which in Iudea was rare. There is no Water more holy than other. Ihon Baptized in Iordan and in Bethabara, and in Aenon. The Ordinance sanctified the Water, but did not require consecrated Water for the due Administration of it. It is from this apparent, that both Christ and Iohn Baptized by dipping the Body in the Water; else they need not have sought places where had been a great plenty of Water; yet it is probable, that they did not constantly dip, from what we read of the Apostles baptizing in Houses, Acts 9.17, 18. and 10.47, 48.

the people came to Iohn and were baptized, that is, great numbers of them did so.