1 Corinthians 10:2

And--"And so" [BENGEL]. baptized unto Moses--the servant of God and representative of the Old Testament covenant of the law: as Jesus, the Son of God, is of the Gospel covenant (Joh 1:17; Heb 3:5-6). The people were led to believe in Moses as God's servant by the miracle of the cloud protecting them, and by their being conducted under him safely through the Red Sea; therefore they are said to be "baptized unto" him (Exo 14:31). "Baptized" is here equivalent to "initiated": it is used in accommodation to Paul's argument to the Corinthians; they, it is true, have been "baptized," but so also virtually were the Israelites of old; if the virtual baptism of the latter availed not to save them from the doom of lust, neither will the actual baptism of the former save them. There is a resemblance between the symbols also: for the cloud and sea consist of water, and as these took the Israelites out of sight, and then restored them again to view, so the water does to the baptized [BENGEL]. OLSHAUSEN understands "the cloud" and "the sea" as symbolizing the Spirit and water respectively (Joh 3:5; Act 10:44-47). Christ is the pillar cloud that screens us from the heat of God's wrath. Christ as "the light of the world" is our "pillar of fire" to guide us in the darkness of the world.

— Jamieson-Fausset-Brown Commentary (public domain)