'Negligent' in the Bible

Be not negligent of the gift that is in thee, which has been given to thee through prophecy, with imposition of the hands of the elderhood.

how shall we escape if we have been negligent of so great salvation, which, having had its commencement in being spoken of by the Lord, has been confirmed to us by those who have heard;

Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth.