David was not long permitted to enjoy the ease of life at court. The aggressive manner assumed by Goliath drove him to the front. It was a curious chance that designated David to be the slayer of Goliath, who was allied with him by the ties of blood. Goliath, it will be remembered, was the son of the Moabitess Orpah, the sister-in-law of David's ancestress Ruth, and her sister as well, both having been the daughters of the Moabite king Eglon.
David and Goliath differed as widely as their grandams, for in contrast to Ruth, the pious, religious Jewess, Orpah had led a life of unspeakable infamy. Her son Goliath was jeered at as "the son of a hundred fathers and one mother." But God lets naught go unrewarded, even in the wicked. In return for the forty steps Orpah had accompanied her mother-in-law Naomi, Goliath the Philistine, her son, was permitted to display his strength and skill for forty days, and in return for the four tears Orpah had shed on parting from her mother-in-law, she was privileged to give birth to four giant sons.