According to Luke: An Analytical Commentary

Luke 1:14-15

14 And thou shalt have joy and gladness (personal and communal rejoicing), and many shall rejoice (not just private but public significance) at his birth (his coming would be a blessing to others).

15 For he (John the Baptist) shall be great

in the sight of the Lord (see lesson #2 at the end of chapter 1),

and shall drink neither wine nor strong drink (John was to be holy. There is, however, no evidence that John was a Nazarite; cf. Numbers 6:1-21),

and he shall be filled (the Spirit temporarily came upon both saved and lost people in the Old Testament economy, but now will indwell within the regenerate) with the Holy Ghost (the third Person of the Trinity) even from his mother’s womb (pre-birth filling, unique and prophetic).