What does Job Chapter 16 say, and which statements belong to its speaker?

Responding to his companions, Job observed that he had heard such speeches many times before, calling his visitors troublesome comforters. He questioned when their windy rhetoric would cease and whether it required any effort for them to utter such reproaches. Had their positions been exchanged, Job remarked that he too could speak in their manner, comforting with words and shaking his head over them, and he says he would strengthen them with his speech and offer gentle words to ease their sorrow. Yet in his present agony, neither speaking nor remaining silent brought relief; his pain neither rested nor departed. Sorrow crushed his remaining strength, he said all his limbs were brought to nothing, his wrinkles bore witness against him, and a false speaker rose to contradict him to his face.

Job portrayed his suffering as a violent assault, describing an adversary who gnashed his teeth in wrath and fixed menacing eyes upon him. Mockers opened their mouths against him, struck him reproachfully upon the cheek, and were filled with his pains. He declared that God had handed him over to the unjust and abandoned him to the power of the wicked. Formerly wealthy, he had suddenly been broken apart: seized by the neck, shattered, and set up as a mark. Surrounded by divine lances, his loins were wounded without pity, his entrails poured out upon the ground, and breach was heaped upon breach as an attacker stormed against him like a giant. In his desolation, Job said he had sowed sackcloth upon his skin and covered his flesh with ashes, his face swollen with weeping and eyelids dim.

In Job’s speech, throughout this devastation, Job insisted that he had committed no injustice and that the prayers he addressed to God were entirely pure. Desiring that his true condition not be obscured, he called upon the earth not to cover his innocent blood or stifle his cry. He affirmed that his witness was in heaven and the One who knew his conscience dwelt on high. While his companions poured out endless words against him, Job turned his tearful eyes directly toward God, longing that a mortal might argue his case before the Almighty as a person reasons with a neighbor. Convinced that his brief remaining years were slipping away, he recognized that he was walking a road from which he would never return.