'Light' in the Bible

Three sons of Zeruiah [the half sister of David] were there: Joab, Abishai, and Asahel. Now Asahel was as light and swift-footed as one of the [wild] gazelles in the field.

So shall we come upon David in one of the places where he can be found, and we will fall on him as the dew falls [unseen and unheard] on the ground; and of him and of all the men who are with him, not even one will be left.

Is like the morning light when the sun rises,A morning without clouds,When the fresh grass springs out of the earthThrough sunshine after rain.’