A.T. Robertson Commentary Matthew 27:65

"Pilate said unto them, Ye have a guard: go, make it [as] sure as ye can." — Matthew 27:65 (ASV)

Make it as sure as you can (ασφαλισασθε ως οιδατε). "Make it secure for yourselves (ingressive aorist middle) as you know how."

Have a guard (εχετε κουστωδιαν), present imperative, a guard of Roman soldiers, not mere temple police. The Latin term koustodia occurs in an Oxyrhynchus papyrus of A.D. 22. "The curt permission to the Jews whom he despised is suitable in the mouth of the Roman official" (McNeile).