Expositor's Bible Commentary Commentary John 8:9

"And they, when they heard it, went out one by one, beginning from the eldest, [even] unto the last: and Jesus was left alone, and the woman, where she was, in the midst." — John 8:9 (ASV)

The accusers “began to go away one at a time, the older ones first.” The older ones either had more sins for which they were answerable or else had more sense than to make an impossible profession of righteousness. Finally the woman was left alone.