He said (ekeinos eipen). Explicit and emphatic pronoun as in Joh 1:8, referring to God as the one who sent John (Joh 1:6).
With the Holy Spirit (en pneumati hagiōi). “In the Holy Spirit.” Here again one needs the background of the Synoptics for the contrast between John’s baptism in water (Joh 1:26) and that of the Messiah in the Holy Spirit (Mar 1:8; Mat 3:11; Luk 3:16).