'Carefully' in the Bible

Then Jehu and Jehonadab son of Rechab entered the temple of Baal, and Jehu said to the servants of Baal, “Look carefully to see that there are no servants of the Lord here among you—only servants of Baal.”

But Jehu did not carefully and wholeheartedly obey the law of the Lord God of Israel. He did not repudiate the sins which Jeroboam had encouraged Israel to commit.

You must carefully obey at all times the rules, regulations, law, and commandments he wrote down for you. You must not worship other gods.

I will not make Israel again leave the land I gave to their ancestors, provided that they carefully obey all I commanded them, the whole law my servant Moses ordered them to obey."