John Calvin's Bible Commentary
Jeremiah 7:6
Then he adds, if ye will not oppress the stranger and the orphan and the widow This also belonged to the judges: but God no doubt shews here generally, that injustice greatly prevailed among the people, as he condemns the cruelty and perfidy of the judges themselves.
As to strangers and orphans and widows, they are often mentioned; for strangers as well as orphans and widows were almost destitute of protection, and were subject to many wrongs, as though they were exposed as a prey. Hence, whenever a right government is referred to, God mentions strangers and orphans and widows; for it might hence be easily understood of what kind was the public administration of justice; for when others obtain their right, it is no matter of wonder, since they have advocates to defend their cause, and they have also the aid of friends. Thus every one who defends his own cause, obtains at least some portion of his right. But when strangers and orphans and widows are not unjustly dealt with, it is an evidence of real integrity; for we may hence conclude, that there is no respect of persons among the judges. But as this subject has been handled elsewhere, I only touch on it lightly here.
And if ye will not shed, he says, innocent blood in this place Here the Prophet accuses the judges of a more heinous crime, and calls them murderers. They had, however, no doubt some plausible pretences for shedding the blood of the innocent. But the Prophet, speaking here in the name of God and by the dictates of his Spirit, overlooks all these as altogether vain, though the judges might have thought them sufficient excuses. By saying, in this place, he shews how foolish was their confidence in boasting of God’s worship, sacrifices, and Temple, while yet they had polluted the Temple with their cruel murders. (191)
He then passes to the first table of the law, If ye will not walk after foreign gods to your evil By stating a part for the whole, he condemns every kind of impiety: for what is it to walk after alien gods but to depart from the pure and legitimate worship of the true God and to corrupt it with superstitions? We see then what the Prophet means: he recalls the Jews to the duty of observing the law, that they might thereby give a veritable evidence of their repentance: “Prove, “he says, “that you have repented from the heart.” He shews how they were to prove this, even by observing the law of God. And, as I have said, he refers to the first Table by stating a part for the whole. As to the second Table, he mentions some particulars which were intended to shew that they violated justice and equity, and also that cruelty and perfidiousness, frauds and rapines, prevailed greatly among them.