The unbelieving Jews was broken off because of unbelief, and the remnant elect Jew will be grafted back into the Olive Tree Jesus Christ
Yes, Its true. Romans 9:v.21-22 and 27 to 29
21 Hath not the potter
(the Potterclay-GOD) power over the clay
(Israel is the clay-Isaiah 64:v.8) , of the same lump to make one vessel unto honour, and another unto dishonour?
22 What if God, willing to shew His wrath, and to make His power known, endured with much longsuffering the vessels of wrath fitted to destruction?
27 Esaias also crieth concerning Israel, Though the number of the children of Israel be as the sand of the sea,
a remnant shall be saved:
28 For he will finish the work, and cut it short in righteousness: because a short work will the Lord make upon the earth.
29 And as Esaias said before,
Except the Lord of Sabaoth had left us a seed, we had been as Sodoma, and been made like unto Gomorrha.
Isaiah 64:v.8 - But now, O Lord, thou art our father;
we are the clay,
and thou our potter; and we all are the work of thy hand.
A Remnant will be saved
Revelation 7:v.1 to 4
1 And after these things I saw four angels standing on the four corners of the earth, holding the four winds of the earth, that the wind should not blow on the earth, nor on the sea, nor on any tree.
2 And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea,
3 Saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in their foreheads.
4 And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel.
The Remnant before GOD's Throne - Revelation 14:v.1 to 3
1 And I looked, and, lo, a Lamb stood on the mount Sion, and with him an hundred forty and four thousand,
having His Father's name written in their foreheads.
2 And I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder: and I heard the voice of harpers harping with their harps:
3 And they sung as it were a new song before the throne, and before the four living beings,
and the elders: and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth---> earth here is Israel - the clay , an old or former dry land <----.
Its it.