Now therefore, our God ... who keepest covenant and mercy - God’s fidelity to His covenant is prominently acknowledged, and well it might; for their whole national history bore testimony to it. But as this could afford them little ground of comfort or of hope while they were so painfully conscious of having violated it, they were driven to seek refuge in the riches of divine grace; and hence the peculiar style of invocation here adopted: “Now therefore, our God, the great, the mighty, and the terrible God, who keepest covenant and mercy.”