He which testifieth (o marturwn). That is Jesus ( Deuteronomy 1:2 ) who has just spoken ( Deuteronomy 22:18 ). Yea: I come quickly (Nai, ercomai tacu). Affirmation again of the promise in Deuteronomy 22:7 Deuteronomy 22:12 . On Nai (Yes) see Deuteronomy 1:7 for the Lord's assent to the call. Then John expresses his absolute belief in the Lord's promise: "Amen: come, Lord Jesus" (Amhn, ercou, Kurie Ihsou). On Amhn see Deuteronomy 1:7 . On ercou see Deuteronomy 22:17 . Note Kurie with Ihsou. As in 1 Corinthians 12:3 ; Philippians 2:11 . For Paul's confidence in the deity of Christ and the certainty of his second coming see Titus 2:13 ; 2 Timothy 4:8 . Marana qa ( 1 Corinthians 16:22 ).