John 10:3

Verse 3. To him the porter openeth. The porter is the doorkeeper. It seems that the more wealthy Jews who owned flocks employed some person to take charge of the flock. At first all shepherds attended their flocks personally by day and by night, and this continued to be commonly the practice, but not always. The sheep hear his voice. The voice of the shepherd. A flock will readily discern the well-known voice of one who is accustomed to attend them. The meaning is, that the people of God will be found disposed to listen to the instructions of those who are appointed by Christ, who preach his pure doctrines, and who show a real love for the church of God.