2 Chronicles 15:11-12

They offered of the spoil which they had brought Taken from Zerah, and his army and allies. They entered into a covenant, &c. Repenting that they had violated their engagements to God, and resolving to attend to, and endeavour to fulfil them in future. The matter of this covenant was nothing but what they were before obliged to. And though no promise could lay any higher obligation upon them than they were already under, yet it would help to increase their sense of the obligation, and to arm them against temptations: and, by joining all together in this, they strengthened the hands of each other. To seek the God of their fathers In the way their fathers had sought him, and in dependence on the promise made to their fathers; with all their heart, and with all their soul For only those seek God acceptably and successfully, who seek him thus. God demands all the heart: and when such an inestimable blessing as the divine favour is to be found, it is proper that the whole heart should be engaged in the pursuit of it.