And it shall be righteousness for us, if we observe to do all these commandments before the LORD our God, as he has commanded us.
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George Leo Haydock
Merciful. Hebrew, "he will justify us. "Chaldean, "reward us. "Justice often denotes the mercy which God shows to his people, and the punishment which he inflicts upon their enemies. (Calmet) (Matthew vi. 1.)
Past, present, and future benefits concur to make the Hebrews observe the commandments. God had rescued them from slavery; (ver. 21,) he had already given them great possessions, and would grant them still more if they would be faithful; as on the other hand, all will be lost if they prove rebellious, ver. 15. (Haydock)