Hebrews 10, 36: You need to persevere so that when you have done the will of God, you will receive what he has promised...[39]But we are not of those who shrink back and are destroyed, but of those who believe and are saved.
Mark 13, 5-13: "[13]...All men will hate you because of me, but he who stands firm to the end will be saved".
It is with these two passages that we can know that what God has promised us is salvation.