'Watchful' in the Bible

Therefore you shall pay attention and be careful to do just as the Lord your God has commanded you; you shall not turn aside to the right or to the left [deviating from My commandments].

Therefore listen, O Israel, and be careful to do them, that it may go well with you and that you may increase greatly [in numbers], as the Lord, the God of your fathers, has promised you, in a land flowing with milk and honey.

It will be [considered] righteousness for us [that is, right standing with God] if we are careful to observe all this commandment before the Lord our God—just as He has commanded us.

“Every commandment that I am commanding you today you shall be careful to do, so that you may live and multiply, and go in and possess the land which the Lord swore [to give] to your fathers.

and you shall be careful to do all the statutes and the judgments which I am setting before you today.

“These are the statutes and judgments (precepts) which you shall be careful to do in the land which the Lord, the God of your fathers, has given you to possess as long as you live on the earth.

“Be careful that you do not offer your burnt offerings in every [cultic] place you see,

“Be careful to listen to all these words which I am commanding you, so that it may be well with you and with your children after you forever, because you will be doing what is good and right in the sight of the Lord your God.

beware that you are not lured (ensnared) into following them, after they have been destroyed before you, and that you do not inquire about their gods, saying, ‘How did these nations serve their gods, so that I too may do likewise?’

“Everything I command you, you shall be careful to do it; you shall not add to it nor take away from it.

You shall remember that you were a slave in Egypt, and you shall be careful to obey these statutes.

You shall act in accordance with the terms of the verdict which they declare to you from that place which the Lord chooses. You shall be careful to act in accordance with all of their instructions.

You shall be careful to perform that [vow] which passes your lips, just as you have made a voluntary vow to the Lord your God, just as you have promised with your own words (mouth).

“Be careful during an outbreak of leprosy, that you diligently observe and do according to all that the Levitical priests teach you; just as I have commanded them, so you shall be careful to do.

“Now it shall be, if you diligently listen to and obey the voice of the Lord your God, being careful to do all of His commandments which I am commanding you today, the Lord your God will set you high above all the nations of the earth.

The Lord will make you the head (leader) and not the tail (follower); and you will be above only, and you will not be beneath, if you listen and pay attention to the commandments of the Lord your God, which I am commanding you today, to observe them carefully.

“But it shall come about, if you do not listen to and obey the voice of the Lord your God, being careful to do all His commandments and His statutes which I am commanding you today, then all these curses will come upon you and overtake you:

“If you are not careful to do all the words of this law that are written in this book, to fear and honor with reverence this glorious and awesome name, the Lord your God,

Assemble the people, the men and the women and children and the stranger (resident alien, foreigner) within your cities, so that they may hear and learn and fear the Lord your God [with awe-filled reverence and profound respect], and be careful to obey all the words of this law.

he said to them, “Take to heart all the words of warning which I am speaking to you today; and you shall command your children to observe them carefully—to do all the words of this law.

So be very careful and watchful of yourselves to love the Lord your God.