Read Psalm 79:1-9
O God, the heathen have invaded your land.
They have desecrated your holy Temple
and left Jerusalem in ruins.
2They left the bodies of your people for the vultures,
the bodies of your servants for wild animals to eat.
3They shed your people’s blood like water;
blood flowed like water all through Jerusalem,
and no one was left to bury the dead.
4The surrounding nations insult us;
they laugh at us and mock us.
5Lord, will you be angry with us for ever?
Will your anger continue to burn like fire?
6Turn your anger on the nations that do not worship you,
on the people who do not pray to you.
7For they have killed your people;
they have ruined your country.
8Do not punish us for the sins of our ancestors.
Have mercy on us now;
we have lost all hope.
9Help us, O God, and save us;
rescue us and forgive our sins
for the sake of your own honour.
This is a violent Psalm. Although the Old Testament doesn't say 'Hate your enemies...' Even Jesus acknowledges that the impression is sometimes given (Matthew 5:43). The Psalmist asks God to punish the nations that have destroyed Jerusalem - leaving dead bodies in the streets.
The Psalmist is honest about his feelings. But he trusts in God to deal with them.
Do not punish us for the sins of our ancestors. Have mercy on us now; we have lost all hope. Help us, O God, and save us; rescue us and forgive our sins for the sake of your own honour.
- Psalm 79:8-9