Indeed, to them you are nothing more than one who sings love songs with a beautiful voice and plays an instrument well, for they hear your words but do not put them into practice.
NIV
Behold, you are to them as a very lovely [love] song of one who has a pleasant voice and can play well on an instrument, for they hear your words but do not do them.
AMP
And, lo, thou art unto them as a very lovely song of one that hath a pleasant voice, and can play well on an instrument: for they hear thy words, but they do them not.
KJV
He did not leave a man or woman alive to be brought to Gath, for he thought, "They might inform on us and say, 'This is what David did." And such was his practice as long as he lived in Philistine territory.""
NIV
And David saved neither man nor woman alive to bring tidings to Gath, thinking, Lest they should say about us, So did David, and so will he do as long as he dwells in the Philistines' country.
AMP
And David saved neither man nor woman alive, to bring tidings to Gath, saying, Lest they should tell on us, saying, So did David, and so will be his manner all the while he dwelleth in the country of the Philistines.
KJV