Learn to do well; seek judgment, relieve the oppressed, judge the fatherless, plead for the widow.(Isaiah 1:17)

Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.(Isaiah 1:18)

If ye be willing and obedient, ye shall eat the good of the land:(Isaiah 1:19)

But if ye refuse and rebel, ye shall be devoured with the sword: for the mouth of the LORD hath spoken it.

How is the faithful city become an harlot! it was full of judgment; righteousness lodged in it; but now murderers.(Isaiah 1:21)

Thy silver is become dross, thy wine mixed with water:(Isaiah 1:22)

Thy princes are rebellious, and companions of thieves: every one loveth gifts, and followeth after rewards: they judge not the fatherless, neither doth the cause of the widow come unto them.(Isaiah 1:23)

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A just God gives punishment and reward
In this article, Dr. Roberto Miranda talks about the importance of warning people about the reality of hell and the consequences of disobedience. He emphasizes the need for reconciliation with God and how faith in Jesus Christ is the only way to enter Gods kingdom.

Isaiah 1:20 - Cross Reference

And I will scatter you among the heathen, and will draw out a sword after you: and your land shall be desolate, and your cities waste. (Leviticus 26:33)

But they shall sit every man under his vine and under his fig tree; and none shall make them afraid: for the mouth of the LORD of hosts hath spoken it. (Micah 4:4)

Woe unto the wicked! it shall be ill with him: for the reward of his hands shall be given him. (Isaiah 3:11)

And the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it. (Isaiah 40:5)

Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip. (Hebrews 2:1)

God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good? (Numbers 23:19)

In hope of eternal life, which God, that cannot lie, promised before the world began; (Titus 1:2)

Moreover all the chief of the priests, and the people, transgressed very much after all the abominations of the heathen; and polluted the house of the LORD which he had hallowed in Jerusalem. (2 Chronicles 36:14)

And also the Strength of Israel will not lie nor repent: for he is not a man, that he should repent. (1 Samuel 15:29)

Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it. (Isaiah 58:14)

But if ye shall still do wickedly, ye shall be consumed, both ye and your king. (1 Samuel 12:25)

Thy men shall fall by the sword, and thy mighty in the war. (Isaiah 3:25)

Therefore will I number you to the sword, and ye shall all bow down to the slaughter: because when I called, ye did not answer; when I spake, ye did not hear; but did evil before mine eyes, and did choose that wherein I delighted not. (Isaiah 65:12)