These commercial activities that upset Jesus were being conducted in an outer court of the Jewish, temple during the observance of the Passover in Jerusalem.
All male Jews were expected to attend this festival, even if they lived a long distance from Jerusalem (Exod 23:17). The money changers were probably exchanging foreign coins of these pilgrims for the appropriate coins with which to pay the temple tax (Matt 17:24).
Continue reading BIBLE CUSTOMS AND CURIOSITIES (COMMERCIALISM IN THE TEMPLE)