A.T. Robertson Commentary Mark 6:56

"And wheresoever he entered, into villages, or into cities, or into the country, they laid the sick in the marketplaces, and besought him that they might touch if it were but the border of his garment: and as many as touched him were made whole." — Mark 6:56 (ASV)

Wheresoever he entered (οπου αν εισεπορευετο). The imperfect indicative with αν used to make a general indefinite statement with the relative adverb. See the same construction at the close of the verse, οσο αν ηψαντο αυτον (aorist indicative and αν in a relative clause),

as many as touched him . One must enlarge the details here to get an idea of the richness of the healing ministry of Jesus. We are now near the close of the Galilean ministry with its many healing mercies and excitement is at the highest pitch (Bruce).