A.T. Robertson Commentary Matthew 19:21

"Jesus said unto him, If thou wouldest be perfect, go, sell that which thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, follow me." — Matthew 19:21 (ASV)

If thou wouldest be perfect (ε θελεις τελειος εινα). Condition of the first class, determined as fulfilled. Jesus assumes that the young man really desires to be perfect (a big adjective that, perfect as God is the goal, 5:48).

That thou hast (σου τα υπαρχοντα). "Thy belongings." The Greek neuter plural participle used like our English word "belongings." It was a huge demand, for he was rich.