Thus, etc. - Such shall be the fate of those astrologers who cost thee such an amount of trouble and money.
thy merchants, from thy youth - that is, with whom thou hast trafficked from thy earliest history, the foreigners sojourning in Babylon for the sake of commerce (Isa 13:14; Jer 51:6, Jer 51:9; Nah 3:16, Nah 3:17) [Barnes]. Rather, the astrologers, with whom Babylon had so many dealings (Isa 47:12-14) [Horsley].
to his quarter - literally, “straight before him” (Eze 1:9, Eze 1:12). The foreigners, whether soothsayers or merchants, shall flee home out of Babylon (Jer 50:16).