John Calvin Commentary Psalms 141:7

"As when one ploweth and cleaveth the earth, Our bones are scattered at the mouth of Sheol." — Psalms 141:7 (ASV)

As one who breaketh, etc. Here David complains that his enemies were not satisfied with inflicting upon him one death — an ordinary kind of death — but were intent on first mangling him and those associated with him, and then casting them into the grave. The common robber on the highway throws the body of his murdered victim whole into the ditch; David tells us that he and those with him were treated more barbarously, their bones being dispersed, as one cleaves wood or stones into fragments, or digs the earth.

From this it appears that David, like Paul, (2 Corinthians 1:9), was delivered from many deaths; and we may learn the duty of continuing to cherish hope of life and deliverance, even when this description may apply to us — that our bones have been broken and scattered.