Genesis 15:6 states that Abram believed the LORD, and it was credited to him as righteousness. Paul references this in Romans 4:3 to illustrate justification by faith, not by works.
Genesis 15:5 describes God's promise to Abram that his descendants would be as numerous as the stars. Hebrews 11:12 reflects on this promise, highlighting the faith of Abraham and the fulfillment of God's word.
Genesis 15:13-14 foretells the 400 years of affliction for Abram's descendants in a foreign land, which is fulfilled in Exodus 12:40-41 when the Israelites leave Egypt after 430 years.
Genesis 15:18 records God's covenant with Abram, promising land from the river of Egypt to the Euphrates. Joshua 1:4 reiterates this promise as the Israelites prepare to enter the Promised Land.