This is exactly what is being talked about (in Romans) by the way. Israel--some broken off; always a remnant; some being grafted back in; and others being grafted in for the first time.
The main thing is:
John 15
1I am the true vine, and my Father is the husbandman. 2Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit. 3Now ye are clean through the word which I have spoken unto you. 4Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned."
"Men gather them"...I wonder what this looks like?
*And what is the fire?
That’s pretty much KJV only translation. Most say they with no reference to who they are. The Hebrews meaning is more explicit that obedience in yielding to the Father’s pruning is what is being dealt with. The fire would signify to me the suffering of the dross being burnt away.
Hebrews 12:3-11
3 Consider him who endured such hostility against himself from sinners,[a] so that you may not grow weary or lose heart.
4 In your struggle against sin you have not yet resisted to the point of shedding your blood.
5 And you have forgotten the exhortation that addresses you as children—
“My child, do not regard lightly the discipline of the Lord,
or lose heart when you are punished by him;
6
for the Lord disciplines those whom he loves,
and chastises every child whom he accepts.”
7 Endure trials for the sake of discipline. God is treating you as children; for what child is there whom a parent does not discipline?
8 If you do not have that discipline in which all children share, then you are illegitimate and not his children.
9 Moreover, we had human parents to discipline us, and we respected them. Should we not be even more willing to be subject to the Father of spirits and live?
10 For they disciplined us for a short time as seemed best to them, but he disciplines us for our good, in order that we may share his holiness.
11 Now, discipline always seems painful rather than pleasant at the time, but later it yields the peaceful fruit of righteousness to those who have been trained by it.