New Revised Standard Version
On that day I will fulfill against Eli all that I have spoken concerning his house, from beginning to end.

Contemporary English Version
I will punish Eli and his family, just as I promised.

New American Bible
On that day I will carry out against Eli everything I have said about his house, beginning to end.

Douay-Rheims Bible
In that day I will raise up against Heli all the things I have spoken concerning his house: I will begin, and I will make an end.

In that day I will raise up against Heli all the things I have spoken concerning his house: I will begin, and I will make an end.

I will perform

1 Samuel 2:27-36 And there came a man of God to Heli, and said to him: Thus saith the Lord: Did I not plainly appear to thy father's house, when they were in Egypt in the house of Pharao? . . .

Numbers 23:19 God is not a man, that he should lie, nor is the son of man, that he should be changed. Hath he said then, and will he not do? hath he spoken, and will he not fulfil?

Joshua 23:15 Therefore as he hath fulfilled in deed, what he promised, and all things prosperous have come: so will he bring upon you all the evils he hath threatened, till he take you away and destroy you from off this excellent land, which he hath given you,

Zechariah 1:6 But yet my words, and my ordinances, which I gave in charge to my servants the prophets, did they not take hold of your fathers, and they returned, and said: As the Lord of hosts thought to do to us according to our ways, and according to our devices, so he hath done to us.

Luke 21:33 Heaven and earth shall pass away: but my words shall not pass away.

when I begin, etc.