'Careful' in the Bible

These serve as a copy and shadow of the heavenly things, as Moses was warned when he was about to complete the tabernacle. For God said, Be careful that you make everything according to the pattern that was shown to you on the mountain.

Be careful not to refuse to listen to Him who is speaking to you. For if they of old did not escape unpunished when they refused to listen to him who spoke on earth, much less shall we escape who turn a deaf ear to Him who now speaks from Heaven.