The Abrahamic Covenant. My favorite part, Hebrews 11:17-19. By faith, Abraham, when being tested by God, offered his only son, Isaac as a sacrifice. God and Abraham were in covenant. Abraham knew that God would remain faithful in His part of covenant, which was to produce further offspring through his son Isaac. Hebrews 11:19: Abraham reasoned that God would raise the dead, that he would have Isaac returned back to him, IF HE OBEYED! Would you give up your Isaac?