God tests Abraham, at the age of 115, by commanding he sacrifice his only son Isaac (Genesis 22).
God promises Abram he will have a son
God promises Abram, at age 85, he will have a son and establishes a covenant with him (Genesis 15). According to the apostle Paul (Galatians 3:17), the time span between this covenant and when the Israelites are freed from Egypt is 430 years.
God calls Abram (later Abraham) at age 75 while he is living in Haran (Genesis 12)