Passage
For I have declared to him that I will judge his house for ever, for the iniquity which he hath known: because his sons made themselves vile, and he restrained them not.
For I have declared to him that I will judge his house for ever, for the iniquity which he hath known: because his sons made themselves vile, and he restrained them not.
1 Samuel 3:11 And Jehovah said to Samuel, Behold, I do a thing in Israel, at which both the ears of every one that heareth it shall tingle.
1 Samuel 3:12 In that day I will perform against Eli all that I have spoken concerning his house; I will begin and make an end.
1 Samuel 3:13 For I have declared to him that I will judge his house for ever, for the iniquity which he hath known: because his sons made themselves vile, and he restrained them not.
1 Samuel 3:14 And therefore I have sworn unto the house of Eli that the iniquity of Eli's house shall not be expiated with sacrifice or oblation for ever.
1 Samuel 3:15 And Samuel lay until the morning, and opened the doors of the house of Jehovah. And Samuel feared to declare the vision to Eli.
The verse centers on "declared", "judge", "house", "ever", "iniquity", "hath", "known", and "sons". It is saying that the verse draws attention to "declared" and "judge", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 12's "In that day I will perform against..." into verse 14's "And therefore I have sworn unto the...", so "declared" and "judge" belong inside that flow. In 1 Samuel context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "declared" and "judge" with trust shaped by these words, not by a vague optimism outside the passage.