Surah 53. An-Najm, Ayah 9

This graphic "description" of the angel's approach, based on an Arabian figure of speech, is meant to convey the idea that the Angel of Revelation became a clearly perceptible, almost tangible, presence.

 lit., he was only two bow-draws away.

Two bow-shots (counting 100 to 150 yards to a bow-shot) would be a clearly visible distance.