Then David went to Mizpeh in the country of Moab. He asked the king of Moab, “Please let my father and mother come and stay with you until I find out what God is planning for me.”
David also defeated the Moabites. He made them lie down on the ground, and he measured them with a length of cord. He measured two lengths for those to be killed, and one cord length for those to be allowed to live. So he made them subject to him and required them to pay taxes.
For the Christian responsibility of a widow's children or grandchildren is to do their duty for their own family, and repay their parents by helping them out. This is what pleases God.
Then the Spirit of the Lord came on Jephthah. He passed through Gilead and Manasseh, then on through Mizpah of Gilead. From there he advanced to attack the Ammonites.
I have also acquired Ruth the Moabite, Mahlon's widow, as my wife. By having children who may inherit his property his name will be kept alive in his family and in his home town. You are witnesses of this today.”
After Saul had made his hold over Israel secure, he fought against all his enemies all around: Moabites, Ammonites, Edomites, the kings of Zobah, and the Philistines. Whatever direction he went he defeated them all.