In Jude it is written that Enoch prophesied about the Lord. I don't see any mention of any OT Saint being regenerated during OT times.Job called Christ my Redeemer. Enoch called Christ Lord as referenced by Jude and his own work (book of Enoch) from which Jude took it.
Many OT Saints possessed great faith that would shame what little faith modern man has. There's no doubt about that.
(1 Cor 12:13) For also by one Spirit we are all baptized into one body, whether Jews or Greeks, whether bond or free, even all were made to drink into one Spirit.1st Corinthians 12:3
This verse is talking about NT times. Do you have any verse speaking about OT Saints being regenerated in OT times?