To keep the peace

(Law) to avoid or to prevent a breach of the peace.

See also: Keep

References in classic literature ?
And you must understand, the young upstarts are present all the while, and I have to keep the peace between them.
And then father was arrested for attempted assault, fined in the police court, and bound over to keep the peace.
The Earl was appointed also to keep the peace towards the celebrated George Buchanan, who had a pension out of the same Abbacy, to a similar extent, and under the like penalty.
Penguillium, I command the peace—I order you to keep the peace.
I called you, Padwar," she said to the lieutenant of the guard, "to protect the person of your princess, and to keep the peace that must not be violated within the royal gardens of the jeddak.
Then in every way the laws will help the citizens to keep the peace with one another?
For Isabel's own sake, therefore--to say nothing of other reasons--it was urgently desirable to keep the peace between the two ladies.
The evidence against him was very clear, and he was bound over to keep the peace for six months.
The landlord (bent, honest man, on trying to keep the peace between us) had given him some odd jobs to do, in the way of small repairs, here and there about the house.
Here was poor Mr Sparkler, not knowing how to keep the peace between them, but humbly inclining to the opinion that they could do no better than agree that they were both remarkably fine women, and that there was no nonsense about either of them--for which gentle recommendation they united in falling upon him frightfully.
Another dismal circumstance is, that Veneering, having the captivating Tippins on one side of him and the bride's aunt on the other, finds it immensely difficult to keep the peace.
But the English lawyers had decided that Parliament was omnipotent--and Parliament, in its omnipotence, instead of trial by jury and the Habeas Corpus, enacted admiralty courts in England to try Americans for offences charged against them as committed in America; instead of the privileges of Magna Charta, nullified the charter itself of Massachusetts Bay; shut up the port of Boston; sent armies and navies to keep the peace and teach the colonies that John Hampden was a rebel and Algernon Sidney a traitor.