Heb 11:13
(13) These all died in faith, not having received the promises, but having seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth.
They all died sanctified in faith as believers, not actually seeing Christ yet but receiving salvation through the promise Of God's covenant.
Heb 11:24-25
(24) By faith Moses, when he was come to years, refused to be called the son of Pharaoh's daughter;
(25) Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season;
That faith is saving belief, the grace of God's spirit working in him to sanctify him so his will was to do, and thus he believed. Even though Christ had not yet come to confirm the Covenant with Him, in efficacy he is the lamb slain from the foundation of the world for Old Testament saints. It was already foreordained that they should be under grace. This biblical principle is illustrated in Revelation 13.
Rev 13:8
(8) And all that dwell upon the earth shall worship him, whose names are not written in the book of life of the Lamb slain from the foundation of the world.
Also do you realized that the Holy Spirit did work in the Old Testament? Yes, He did!
Zec 14:8-9
(8) And it shall be in that day, that living waters shall go out from Jerusalem; half of them toward the former sea, and half of them toward the hinder sea: in summer and in winter shall it be.
(9) And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one.
The Holy Spirit as the Living Water came from the Cross, and half of it went toward the former sea, the Old Testament Saints, and the hinder sea, the New Testament Saints. The Holy Spirit did come upon individuals in the Old Testament per Ex odus 31:3, 2nd Samuel 23:2, Judges 3:10; 6:34; 11:29). Therefore, the Holy Spirit did sanctify the Old Testament Saints like we are today, and they all were made new creatures in Christ before the foundation of the Earth. Selah!