C. F. Keil and Franz Delitzsch on Jeremiah 42:12

Jer 42:12 "I shall give you compassion," i.e., obtain it for you, so that the king of Babylon will show pity on you; cf. Gen 43:14; 1Ki 8:50. J. D. Michaelis, Hitzig, Ewald, and Graf, following the lxx, Vulgate, and Syriac, would change והשׁיב into הושׁיב (make you dwell); but there is no necessity for this, since השׁיב makes good enough sense, provided we refer it, not to the return of those who had been exiled to Babylon, but, as the connection requires, to the departure from Mizpah, after the half near Bethlehem, in the intended flight to Egypt; we must, besides, view this departure as a complete forsaking of their country, and the leaders in this emigration as being fugitives who had fled before the Chaldeans, and had returned only a short time before, for the purpose of settling down again in the country.