John Gill Commentary Judges 19:17

"And he lifted up his eyes, and saw the wayfaring man in the street of the city; and the old man said, Whither goest thou? and whence comest thou?" — Judges 19:17 (ASV)

And when he had lifted up his eyes
For it may be, as he came out of the field, he was musing and meditating with his eyes downwards directed, but coming into the city looked up:

he saw a wayfaring man in the street of the city ;
whom he supposed to be a traveller and a stranger by his dress, and other circumstances, having never seen him before, and knowing pretty well the inhabitants of the place:

and the old man said, whither goest thou? and whence comest thou ?
the meaning of the questions is, what place he was travelling to, and from where he came last.