C. F. Keil and Franz Delitzsch on 1 Samuel 12:15

1Sa 12:15

“But if ye do not hearken to the voice of Jehovah, and strive against His commandment, the hand of Jehovah will be heavy upon you, as upon your fathers.” ו in the sense of as, i.e., used in a comparative sense, is most frequently placed before whole sentences (see Ewald, §340, b.); and the use of it here may be explained, on the ground that בּאבתיכם contains the force of an entire sentence: “as it was upon your fathers.” The allusion to the fathers is very suitable here, because the people were looking to the king for the removal of all the calamities, which had fallen upon them from time immemorial. The paraphrase of this word, which is adopted in the Septuagint, ἐπὶ τὸν βασιλέα ὑμῶν, is a very unhappy conjecture, although Thenius proposes to alter the text to suit it.