Job is a type of Christ. He was perfect and upright, and wealthier than anyone. This depicts His glory.
"There was a man in the land of Uz, whose name was Job; and that man was perfect and upright, and one that feared God, and eschewed evil. His substance also was seven thousand sheep, and three thousand camels, and five hundred yoke of oxen, and five hundred she asses, and a very great household; so that this man was the greatest of all the men of the east. And the Lord said unto Satan, Hast thou considered my servant Job, that there is none like him in the earth, a perfect and an upright man, one that feareth God, and escheweth evil?"
Job 1:1, 3, 8 KJV
His 7 sons and 3 daughters are a type of Christ's bride, or the church fallen in Adam. They are wicked sinners, partying every night.
"And there were born unto him seven sons and three daughters. And his sons went and feasted in their houses, every one his day; and sent and called for their three sisters to eat and to drink with them."
Job 1:2, 4 KJV
This is why Job would intercede for them.
"And it was so, when the days of their feasting were gone about, that Job sent and sanctified them, and rose up early in the morning, and offered burnt offerings according to the number of them all: for Job said, It may be that my sons have sinned, and cursed God in their hearts. Thus did Job continually."
Job 1:5 KJV
Well, they all died. But, the good news is that God loved Job and Job loved His children. God gave Job 7 sons and 3 daughters but gave him more wealth.
"So the Lord blessed the latter end of Job more than his beginning: for he had fourteen thousand sheep, and six thousand camels, and a thousand yoke of oxen, and a thousand she asses. He had also seven sons and three daughters. And in all the land were no women found so fair as the daughters of Job: and their father gave them inheritance among their brethren."
Job 42:12-13, 15 KJV
I think it's very interesting that Job was given back more if everything except children.
Just like Christ was given a people by the Father to save, not one sheep will be lost. They will all be born again in Christ.