'Sun' in the Bible

But Joab and Abishai pursued Abner, and when the sun was going down, they came to the hill of Ammah, which is in front of Giah by the way of the wilderness of Gibeon.

Then all the people came to persuade David to eat bread while it was still day; but David vowed, saying, “May God do so to me, and more also, if I taste bread or anything else before the sun goes down.”

Indeed you did it secretly, but I will do this thing before all Israel, and under the sun.’”

Is as the light of the morning when the sun rises,A morning without clouds,When the tender grass springs out of the earth,Through sunshine after rain.’