Be on guard! Be alert! You do not know when that time will come.
OJBBeware, stay shomer (on guard), for you do not have daas when the time is.
TCENTBe on guard; stay alert and pray! For you do not know when the time is coming.
T4TSo be ready, like people who are waiting for an important man to come, because you do not know when that time will come when all these events will happen!