Matthew Poole and continuators on Psalms 79:12

12 And render unto our neighbours sevenfold into their bosom , there reproach wherewith they have reproached thee, , O Lord.

(i. e.) Either 1. Abundantly, as this Phrase notes, Isa. 65. 6, 7. Ier. 32. 18. Luke 6. 38. Or 2. Sensibly, so as it may come home to them, and fall heavily upon them in their own persons.

As impotent or unfaithful or unmerciful to his own people. So they intimate that this dedesire did not proceed from a revengeful mind, but from a due sence of God's favour.