Psalms 56:9

7 In spite of such sin, will they escape? In Your anger, O God, cast down the nations.

8 You have taken account of my wanderings. Put my tears in Your bottle— are they not in Your book?

Then my enemies will retreat on the day I cry for help. By this I will know that God is on my side.

10 In God, whose word I praise, in the LORD, whose word I praise,

11 in God I trust; I will not be afraid. What can man do to me?

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Then my enemies will retreat on the day I cry for help. By this I will know that God is on my side.
KJV
When I cry unto thee, then shall mine enemies turn back: this I know; for God is for me.
WEB
Then my enemies shall turn back in the day that I call. I know this: that God is for me.
ASV
Then shall mine enemies turn back in the day that I call: This I know, that God is for me.
DARBY
Then shall mine enemies return backward in the day when I call: this I know, for God is for me.
BLB
Then my enemies will turn back on the day I cry out. This I have known, that God [is] for me.
ÅB
Da skal mine fiender vende tilbake, på den dag jeg roper; dette vet jeg at Gud er med meg.
OTB
Da vil mine fiender trekke seg tilbake den dagen jeg roper;
Dette vet jeg, at Gud er med meg.
B1930
Da skal mine fiender vende tilbake, på den dag jeg roper; dette vet jeg at Gud er med mig.

Study notes (Tyndale)

Original text and word study

Cross references