1 Samuel 3:14

Therefore I have sworn to the house of Eli that the iniquity of Eli’s house shall not be atoned for by sacrifice or offering forever.”

Isaiah 22:14

But the Lord of hosts revealed Himself to me,
“Surely this iniquity shall not be forgiven you
Until you die,” says the Lord God of hosts.

1 Samuel 2:25

If one man sins against another, God will mediate for him; but if a man sins against the Lord, who can intercede for him?” But they would not listen to the voice of their father, for the Lord desired to put them to death.

Leviticus 15:31

“Thus you shall keep the sons of Israel separated from their uncleanness, so that they will not die in their uncleanness by their defiling My tabernacle that is among them.”

Numbers 15:30-31

But the person who does anything defiantly, whether he is native or an alien, that one is blaspheming the Lord; and that person shall be cut off from among his people.

Psalm 51:16

For You do not delight in sacrifice, otherwise I would give it;
You are not pleased with burnt offering.

Jeremiah 7:16

“As for you, do not pray for this people, and do not lift up cry or prayer for them, and do not intercede with Me; for I do not hear you.

Jeremiah 15:1

Then the Lord said to me, “Even though Moses and Samuel were to stand before Me, My heart would not be with this people; send them away from My presence and let them go!

Ezekiel 24:13

“In your filthiness is lewdness.
Because I would have cleansed you,
Yet you are not clean,
You will not be cleansed from your filthiness again
Until I have spent My wrath on you.

Hebrews 10:4-10

For it is impossible for the blood of bulls and goats to take away sins.

Hebrews 10:26-31

For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,

Treasury of Scripture Knowledge

Summary

And therefore I have sworn unto the house of Eli, that the iniquity of Eli's house shall not be purged with sacrifice nor offering for ever.

Bible References

The iniquity

1 Samuel 2:25
If one man sins against another, God will mediate for him; but if a man sins against the Lord, who can intercede for him?” But they would not listen to the voice of their father, for the Lord desired to put them to death.
Numbers 15:30
But the person who does anything defiantly, whether he is native or an alien, that one is blaspheming the Lord; and that person shall be cut off from among his people.
Psalm 51:16
For You do not delight in sacrifice, otherwise I would give it;
You are not pleased with burnt offering.
Isaiah 22:14
But the Lord of hosts revealed Himself to me,
“Surely this iniquity shall not be forgiven you
Until you die,” says the Lord God of hosts.
Jeremiah 7:16
“As for you, do not pray for this people, and do not lift up cry or prayer for them, and do not intercede with Me; for I do not hear you.
Jeremiah 15:1
Then the Lord said to me, “Even though Moses and Samuel were to stand before Me, My heart would not be with this people; send them away from My presence and let them go!
Ezekiel 24:13
“In your filthiness is lewdness.
Because I would have cleansed you,
Yet you are not clean,
You will not be cleansed from your filthiness again
Until I have spent My wrath on you.
Hebrews 10:4
For it is impossible for the blood of bulls and goats to take away sins.