'Believed God' in the Bible

For what does the Scripture say? [Gen. 15:6 says], "And Abraham believed God, so God considered him righteous."

Now in response to the [proclamation of the] good news [about Christ], the Jews became [God's] enemies for the sake of you [Gentiles]. But concerning [God's] select people, these Jews became [God's] dearly loved ones for the sake of their forefathers [i.e, who believed God's promises regarding their descendants].