15 Some people are like seed along the path, where the word is sown. As soon as they hear it, Satan comes and takes away the word that was sown in them.

Read Mark 4:15 Using Other Translations

And these are they by the way side, where the word is sown; but when they have heard, Satan cometh immediately, and taketh away the word that was sown in their hearts.
And these are the ones along the path, where the word is sown: when they hear, Satan immediately comes and takes away the word that is sown in them.
The seed that fell on the footpath represents those who hear the message, only to have Satan come at once and take it away.