17 After he had left the crowd and entered the house, his disciples asked him about this parable.

Read Mark 7:17 Using Other Translations

And when he was entered into the house from the people, his disciples asked him concerning the parable.
And when he had entered the house and left the people, his disciples asked him about the parable.
Then Jesus went into a house to get away from the crowd, and his disciples asked him what he meant by the parable he had just used.