John Gill Commentary John 5:13

"But he that was healed knew not who it was; for Jesus had conveyed himself away, a multitude being in the place." — John 5:13 (ASV)

And he that was healed, wist not who he was
He had never seen, and perhaps had never heard of Christ before, and so knew him not; and besides, Christ gave him no opportunity of conversing with him, or so much as to ask him who he was:

for Jesus had conveyed himself away ;
had slipped away, as soon as ever he had wrought the miracle:

a multitude being in [that] place ;
or "from the multitude that were in [that] place"; not that he hid himself among them, and there remained undiscovered; but he passed through them, and went his way to the temple, where he found the man he had healed, as in the following verse.