A.T. Robertson Commentary Luke 1:67

"And his father Zacharias was filled with the Holy Spirit, and prophesied, saying," — Luke 1:67 (ASV)

Prophesied (επροφητευσεν). Under the guidance of the Holy Spirit. This Benedictus (Ευλογητος, Blessed ) of Zacharias (68-79) may be what is referred to in verse 64 "he began to speak blessing God" (ευλογων). Nearly every phrase here is found in the O.T. (Psalms and Prophets). He, like Mary, was full of the Holy Spirit and had caught the Messianic message in its highest meaning.