Heb 10:36-39, 2 Pt 3:9-10
In the Old Testament, God had the prophet Habakkuk write the revelations of God on stone tablets. And God said that the revelation will come true, and those who believe in it to the end will live. (Hab 2:2-4)
Hab 2:2 And the Lord answered me, and said, Write the vision, and make it plain upon tables, that he may run that readeth it. 3 For the vision is yet for an appointed time, but at the end it shall speak, and not lie: though it tarry, wait for it; because it will surely come, it will not tarry. 4 Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith.
We must believe to the end that Jesus is the Christ. Jesus, the Christ, will come without delay. (Hebrews 10:35-39)
Hebrews 10:35 Cast not away therefore your confidence, which hath great recompence of reward. 36 For ye have need of patience, that, after ye have done the will of God, ye might receive the promise. 37 For yet a little while, and he that shall come will come, and will not tarry. 38 Now the just shall live by faith: but if any man draw back, my soul shall have no pleasure in him. 39 But we are not of them who draw back unto perdition; but of them that believe to the saving of the soul.
It is not that the second coming of Jesus is delayed, but God wants more people to be saved. (2 Peter 3:9-10)
2 Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance. 10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.