C. F. Keil and Franz Delitzsch on 1 Samuel 14:38-39

1Sa 14:38-39

When Saul perceived, this, he directed all the heads of the people (pinnoth, as in Jdg 20:2) to draw near to learn whereby (wherein) the sin had occurred that day, and declared, “As truly as Jehovah liveth, who has brought salvation to Israel, even if it were upon Jonathan my son, he shall die.” The first כּי in 1Sa 14:39 is explanatory; the second and third serve to introduce the words, like ὅτι, quod; and the repetition serves to give emphasis, lit., “that even if it were upon my son, that he shall die.” “And of all the people no one answered him,” from terror at the king’s word.