ii. The Rock (16:18) Then came the memorable words, “Thou art Peter [petros], and upon this rock [petra] I will build my church; and the gates of hell shall not prevail against it.” The two Greek words are distinct. Petros is in the masculine gender and denotes a loose stone or pebble. Petra is in the feminine gender and denotes a rock or a cliff, firm and immovable. (The rocky Edomite stronghold of Seir is called Petra to this day.) Petra in 16:18 refers to Christ. The church is not built on Peter,
Matthew 16:18