Luke 18:28

‘And Peter said, “Lo, we have left our own, and followed you.” '

Impetuous Peter, ever the one to break in, was now stirred in his heart by the thought of the impossibility of salvation without God's working in the heart and cried, ‘Look, we have left all and followed you, like you are asking this ruler to do. What about us?' He was probably seeking to gain assurance for himself and his fellow disciples that they did have the certainty of eternal life rather than thinking only of reward. He wanted to be sure that God was doing the impossible in his heart. For the disciples were still very much learners (as will shortly become apparent in Luke 18:31). That is why Jesus could answer as He did.

Note the words ‘we have left our own'. This gave a wide coverage, their own homes, their own land, their own fishing businesses, their own families, their own environment, their own possessions, and so on. All that they had treasured they had left for Him.