Atonement for Our Sins Is Forever Complete...

Why were Isaiah's sins forgiven when an angel touched Isaiah's lips with a coal from the altar in heaven?

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9 According to all that I show you, that is, the pattern of the tabernacle and the pattern of all its furnishings, just so you shall make it. – Exodus 25:9


40 And see to it that you make them according to the pattern which was shown you on the mountain. – Exodus 25:40


10 And Aaron shall make atonement upon [the altar's] horns once a year with the blood of the sin offering of atonement; once a year he shall make atonement upon it throughout your generations. It is most holy to the LORD.” – Exodus 30:10


1 In the year that King Uzziah died, I saw the Lord sitting on a throne, high and lifted up, and the train of His robe filled the temple. 2 Above it stood seraphim; each one had six wings: with two he covered his face, with two he covered his feet, and with two he flew. 3 And one cried to another and said:
“Holy, holy, holy is the LORD of hosts;
The whole earth is full of His glory!”
4 And the posts of the door were shaken by the voice of him who cried out, and the house was filled with smoke. 5 So I said:
“Woe is me, for I am undone!
Because I am a man of unclean lips,
And I dwell in the midst of a people of unclean lips;
For my eyes have seen the King,
The LORD of hosts.”
6 Then one of the seraphim flew to me, having in his hand a live coal which he had taken with the tongs from the altar. 7 And he touched my mouth with it, and said:
“Behold, this has touched your lips;
Your iniquity is taken away,
And your sin purged.” –Isaiah 6:1-6


19 For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and goats, with water, scarlet wool, and hyssop, and sprinkled both the book itself and all the people, 20 saying, “This is the blood of the covenant which God has commanded you.” 21 Then likewise he sprinkled with blood both the tabernacle and all the vessels of the ministry. 22 And according to the law almost all things are purified with blood, and without shedding of blood there is no remission.
23 Therefore it was necessary that the copies of the things in the heavens should be purified with these, but the heavenly things themselves with better sacrifices than these.
24 For the Anointed One has not entered the holy places made with hands, which are copies of the true, but into heaven itself, now to appear in the presence of God for us; 25 not that He should offer Himself often, as the high priest enters the Most Holy Place every year with blood of another— 26 He then would have had to suffer often since the foundation of the world; but now, once at the end of the ages, He has appeared to put away sin by the sacrifice of Himself. – Hebrews 9:19-26


1 For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect.
2 For then would they not have ceased to be offered? For the worshipers, once purified, would have had no more consciousness of sins. 3 But in those sacrifices there is a reminder of sins every year. 4 For it is not possible that the blood of bulls and goats could take away sins. 5 Therefore, when He came into the world, He said:
“Sacrifice and offering You did not desire,
But a body You have prepared for Me.
6 In burnt offerings and sacrifices for sin
You had no pleasure.
7 Then I said, ‘Behold, I have come—
In the volume of the book it is written of Me—
To do Your will, O God.’”
8 Previously saying, “Sacrifice and offering, burnt offerings, and offerings for sin You did not desire, nor had pleasure in them” (which are offered according to the law), 9 then He said, “Behold, I have come to do Your will, O God.” He takes away the first that He may establish the second. 10 By that will we have been sanctified through the offering of the body of Jesus [the Anointed One] once for all.
11 And every priest stands ministering daily and offering repeatedly the same sacrifices, which can never take away sins. 12 But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God, 13 from that time waiting till His enemies are made His footstool.
14 For by one offering He has perfected forever those who are being sanctified. 15 But the Holy Spirit also witnesses to us; for after He had said before,
16 “This is the covenant that I will make with them after those days, says the LORD: I will put My laws into their hearts, and in their minds I will write them,” 17 then He adds, “Their sins and their lawless deeds I will remember no more.” 18 Now where there is remission of these, there is no longer an offering for sin. – Hebrews 10:1-18


20 [The Anointed One] indeed was foreordained before the foundation of the world, but was manifest in these last times for you. – 1 Peter 1:20


8 For He said, “Surely they are My people, children who will not lie.” So He became their Savior. 9 In all their affliction He was afflicted, and the Angel of His Presence saved them…” – Isaiah 63:8-9a


20 “Behold, I send an Angel before you to keep you in the way and to bring you into the place which I have prepared. 21 Beware of Him and obey His voice; do not provoke Him, for He will not pardon your transgressions; for My name is in Him. – Exodus 23:20-21


7 “I will declare the decree: The LORD has said to Me, ‘You are My Son, Today I have begotten You. 8 Ask of Me, and I will give You The nations for Your inheritance, And the ends of the earth for Your possession. 9 You shall break them with a rod of iron; You shall dash them to pieces like a potter’s vessel.’” 10 Now therefore, be wise, O kings; Be instructed, you judges of the earth. 11 Serve the LORD with fear, And rejoice with trembling. 12 Kiss the Son, lest He be angry, And you perish in the way, When His wrath is kindled but a little. Blessed are all those who put their trust in Him. – Psalm 2:7-12