Jamieson, Fausset & Brown

Utter exhaustion and hopeless weakness, in these circumstances of pressing danger, are set forth by the most expressive figures; the solidity of the body is destroyed, and it becomes like water; the bones are parted; the heart, the very seat of vitality, melts like wax; all the juices of the system are dried up; the tongue can no longer perform its office, but lies parched and stiffened (compare Gen 49:4; Sa2 14:14; Psa 58:8). In this, God is regarded as the ultimate source, and men as the instruments.