Greek

Ἦν δὲ διδάσκων ἐν μιᾷ τῶν συναγωγῶν τοῖς σάββασιν

Transliterated

ēn de didaskōn en mia tōn synagōgōn tois sabbasin

Literal English

There was however teaching in first [day] of the synagogues on the Sabbaths
Bible Hub

Definitions