1 Samuel 20:22

But if I say thus unto the young man, Behold, the arrows are beyond thee; go thy way: for the Lord hath sent thee away.

Cross-references

In 1 Samuel 20:36, Jonathan shoots arrows beyond the lad, exactly executing the signal described here.

In 1 Samuel 20:42, after the signal, Jonathan sends David away with a covenant blessing, concluding the warning.