This verse, quoting the words of King Yehoshafat, is cited in Tachanun. Eicha Rabbosi contrasts the ways of four kings. David pursued his enemies and destroyed them; Asa pursued but did not have the strength to destoy; Yehoshafat did not even have the strength to pursue, so he prayed; Chizkiyahu did not even possess that much strength. The Midrash’s understanding of Yehoshafat’s approach is based on this verse.