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1 Samuel 3:10 Now the LORD came and stood and called as at other times, "Samuel! Samuel!" And Samuel answered, "Speak, for Your servant hears."11 Then the LORD said to Samuel: "Behold, I will do something in Israel at which both ears of everyone who hears it will tingle.12 "In that day I will perform against Eli all that I have spoken concerning his house, from beginning to end.13 "For I have told him that I will judge his house forever for the iniquity which he knows, because his sons made themselves vile, and he did not restrain them.14 "And 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."
Eli and his sons were priests and Eli’s sons abused their office.
1 Samuel 2:12 Now the sons of Eli were corrupt; they did not know the LORD.....17... the sin of the young men was very great before the LORD, for men abhorred the offering of the LORD.
Eli should have removed them from office but didn’t.God had already told him that his sons would die because of their behaviour.
1 Samuel 2:34 ‘Now this shall be a sign to you that will come upon your two sons, on Hophni and Phinehas: in one day they shall die, both of them.
‘I will do something in Israel at which both ears of everyone who hears it will tingle’ refers to the capture of the Ark of the Covenant by the Philistines; the report of which caused Eli to fall from his seat and die (recorded in 1 Samuel 4).
I hope this helps.