But thou shalt die in peace: and with the burnings of thy fathers, the former kings which were before thee, so shall they burn odours for thee; and they will lament thee, saying, Ah lord! for I have pronounced the word, saith the LORD. Thou shalt die in peace - Thou shalt not die a violent death; and at thy death thou shalt have all those funereal solemnities which were usual at the demise of kings. See 2 Chronicles 16:14.
So shall they burn odours for thee - Scented wood and other odoriferous substances are placed on the funeral pile of the rich Hindoos, and burned with the body.
And they will lament thee, saying, Ah lord! - They will recite the funeral dirge that begins with those words. See the note on Jeremiah 22:18 (note).