A.T. Robertson Commentary Luke 4:36

"And amazement came upon all, and they spake together, one with another, saying, What is this word? for with authority and power he commandeth the unclean spirits, and they come out." — Luke 4:36 (ASV)

Amazement came (εγενετο θαμβος). Mark has εθαμβηθησαν.

They spake together one with another (συνελαλουν προς αλληλους). Imperfect indicative active and the reciprocal pronoun. Mark has simply the infinitive συνζητειν (question).

For (οτ). We have here an ambiguous οτ as in 1:45, which can be either the relative "that" or the casual οτ "because" or "for," as the Revised Version has it. Either makes good sense. Luke adds here δυναμε (with power) to Mark's "authority" (εξουσιαν).

And they come out (εξερχοντα). So Luke where Mark has "and they obey him" (κα υπακουουσιν αυτω).