1 Samuel 20:36 - Ellicott's Commentary On The Whole Bible

He shot an arrow beyond him. — This was the sign agreed on if all was over for David at the court of Saul. Expositors are in a little difficulty, though, here, as only one arrow is mentioned, whereas “three” had to be shot according to the terms of the understanding. We cannot imagine, as some have suggested, that “Jonathan shortened the affair, and shot only once, considering that there was danger in delay,” and that every moment was of consequence; had there been such need of haste, the parting scene would have been cut even shorter. It is better, with Keil, to assume that the “singular” here stands in an indefinite general way, the author not thinking it needful, after what he had before said, to state that Jonathan shot three arrows one after another.