Then David enquired of the LORD yet again. And the LORD answered him and said, Arise, go down to Keilah; for I will deliver the Philistines into thine hand.
I noticed that when a problem arose, that David's men were afraid, it said,
Then David enquired of the LORD yet again. Also, in v11,12, David asked the Lord two questions, and, after the Lord answered the first part, David asked the Lord the second part again, to get the rest of the answer.
When we pray about something, we shouldn't think "I already prayed about it, so I don't have to pray about it any more." When new concerns arise, it is OK to pray anew. We should "inquire of the Lord yet again."