Sorry about the tongues reference. I thought you were speaking of "spirit baptism" as distinct from "accepting Christ as personal Lord and Savior". Such conversations often start out with the verse you finished with.
As to not finding "any such verse": Try 1 Cor 5 (5,6,7 or 8?). I think it's "..Christ our paschal lamb is sacrificed for us: Therefore let us keep the feast"
1 Corinthians 5:7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us:
8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.