In Job 31 and 32 Job states that if he has done wrong someone should be found who will attest to what he has done. Then he will own up to the wrongdoing. But his friends can not answer Job’s request because he is righteous.
A young man named Elihu is angry that Job has justified himself and that his friends have not brought any charge against him. He has been afraid to speak because of his age but he can hold out no longer.
Psalm 86 is a prayer of supplication. It is filled with praise and thanksgiving to God, not simply a list of requests. When we come to God we should do so out of gratitude for the blessings God has already given us. We must not take God for granted.
Psalm 87 is a tribute to Jerusalem, the city God founded.