“For,” said Peter, “it is written in the Book of Psalms: “ ‘May his place be deserted; let there be no one to dwell in it,’ and, “ ‘May another take his place of leadership.’
Acts 1:20 NIV

The Holy Spirit revealed to the disciples the connections such as these to the old testament. I don’t think this is something that they grew up being taught from the priests. I also don’t think Peter would have made this connection on his own. But as we will see the disciples did not get it all right we wont either. We must remember that everything that God has revealed through the writters of the bible is complete. There is no new revelation. But He still speaks to us through His word in the power of the Holy Spirit. Sometimes the hard part is knowing what to do with the information and when.

Many are the plans in a person’s heart, but it is the Lord’s purpose that prevails.
Proverbs 19:21 NIV

I have always loved this verse. I am so grateful that this is the truth. Since it stood out to me today I shared it. Then as I read Job I see why it stood out.

“I know that you can do all things; no purpose of yours can be thwarted. You asked, ‘Who is this that obscures my plans without knowledge?’ Surely I spoke of things I did not understand, things too wonderful for me to know.
Job 42:2‭-‬3 NIV

Job comes to realize this and acknowledges the he cannot understand God’s ways.

My ears had heard of you but now my eyes have seen you. Therefore I despise myself and repent in dust and ashes.”
Job 42:5‭-‬6 NIV

And this experience with God allows him to see and know God better.

After Job had prayed for his friends, the Lord restored his fortunes and gave him twice as much as he had before.
Job 42:10 NIV

God makes up for all that Job had gone through by doubling everything that Job had lost. Everything but double children.

And he also had seven sons and three daughters.
Job 42:13 NIV

The reason he does not get 14 kids is because he still has 7 kids in heaven and will be reunited with them and his children will be doubled.