https://www.biblegateway.com/passage/?search=Genesis%2015&version=KJV
A two things to point out.
Starting with verse 6: Abraham believed in the Lord and that faith was counted towards righteousness. God desires Faith from His people.
Verse 13: The dream he has speaks of the future generations being held captive in Egypt for 400 years until set free from captivity.
Amazing to see how everything took place and how God was still in control.
God bless you and your loved ones.