Render to our neighbors sevenfold into their bosom. It seems to me that he does not ask against them, but for them: that is, give them your sabbath. Now "sabbath" is interpreted as rest. What he says is this: make them rest in their wickedness. Or else, otherwise: render it to them here, and do not render it to them in the time to come.
Source: Homily 12, on Psalm 78