John Wesley on 2 Samuel 1:20

Tell it not - This is not a precept, but a poetical wish; whereby he doth not so much desire, that this might not be done, which he knew to be impossible; as, express his great sorrow, because it would be done, to the dishonour of God, and of his people. The daughters - He mentions these, because it was the custom of women in those times and places to celebrate those victories which their men obtained, with triumphant songs and dances.