Numbers 15:34

And they put him in ward, because it was not declared what should be done to him.

Cross-reference

Numbers 27:5 shows Moses bringing a case before the Lord — the same step of seeking divine guidance that follows the custody in this verse.

Leviticus 24:12 records the same phrase 'put him in ward' for a blasphemer awaiting divine judgment — identical procedure for unresolved capital cases.