ALL ISRAEL SHALL BE SAVED
Rom 11:25-26

25 For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.

26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
KJV

In the Old Testament type, when God took His people Israel out of Egypt; what percentage of them did He take? He took “all.” Notice they came out by the blood of a substitute which points to the blood of “the Lamb” - Jesus Christ who is our substitute.
God taking Israel out of Egypt, was done by His mighty power, typifying their salvation/deliverance was all of God; the picture/type of spirit being saved, which is the “gift” of God - all God.

Eph 2:8-9

8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:

9 Not of works, lest any man should boast.
KJV

However, Israel came out of Egypt for a specific purpose - an inheritance. But having come out of Egypt they had to fight for it, they lost many of the battles and all but Caleb and Joshua came short of Canaan. For Israel to reach it, they had to keep their eyes on the goal:

Phil 2:12
12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling.
KJV

Israel did not obey, resulting in them not realize their purpose; (picturing what’s necessary for the salvation of our souls - a salvation realized at the end of our faith/walk), though they had a destiny for the redeemed.

1 Peter 1:9
9 Receiving the end of your faith, even the salvation of your souls.
KJV