'Strict' in the Bible

Then He gave them strict orders that no one should know about this and said that she should be given something to eat.

Therefore, be continually on the alert—for you do not know when the master of the house is coming, whether in the evening, or at midnight, or when the rooster crows, or in the morning—

What I say to you I say to everyone, ‘Be on the alert [stay awake and be continually cautious]!’”