'Sure' in the Bible

Command therefore that the sepulchre be made sure until the third day, lest his disciples come by night, and steal him away, and say unto the people, He is risen from the dead: so the last error shall be worse than the first.

Pilate said unto them, Ye have a watch: go your way, make it as sure as ye can.

So they went, and made the sepulchre sure, sealing the stone, and setting a watch.