Ps 148:6

“"He hath established them for the age, and for age upon age" (ver. 6). All things in heaven, all things above, all powers and angels, a certain city on high, good, holy, blessed; from whence because we are wanderers, we are wretched; whither because we are to return, we are blessed in hope; whither when we shall have returned, we shall be blessed indeed; "He hath given them a law which shall not pass away." What sort of command, think ye, have things in heaven and the holy angels received? What sort of command hath God given them? What, but that they praise Him? Blessed are they whose business is to praise God! They plough not, they sow not, they grind not, they cook not; for these are works of necessity, and there is no necessity there. They steal not, they plunder not, they commit no adultery; for these are works of iniquity, and there is no iniquity there. They break not bread for the hungry, they clothe not the naked, they take not in the stranger, they visit not the sick, they set not at one the contentious, they bury not the dead; for these are works of mercy, and there there is no misery, for mercy to be shown to. O blessed they! Think we that we too shall be like this? Ah! let us sigh, let us groan in sighing. And what are we, that we should be there? mortal, outcast, abject, earth and ashes! But He, who hath promised, is almighty. ...”

“Scripture tends to lead back to the first beginning by means of reformation, or it describes eternal things, as in the Laws and Gospels. Hence in the Psalm: "He gave them a duty which shall not pass away." For it is not to be understood that the Law or the Commandments will pass away, but rather that they will be better served in the fatherland. For they are not served in the same manner under the Old Testament and under the New Testament: they are served better under the New Testament, and yet better still in the fatherland. God indeed lives by these very Laws which He Himself has given.”