26For whoever is ASHAMED of Me and My words, of him the Son of Man will be ASHAMED when He comes in His own glory, and in His Father’s, and of the holy angels (Luke 9:26).

All born-again Christians have a secure salvation in the New Covenant eternal Kingdom after AD 70.  There is a difference between those transition period saints and those saints who live after Christ’s Parousia, ending in AD 70.

The warning by Christ regarding those who were ASHAMED of Him at His second coming was applicable to those to whom He was referring to as “this adulterous and sinful generation” of the first century Jews.  His being ASHAMED of them would only occur at His Parousia, “when He comes in glory with His angels,” which took place in AD 66-70.

38For whoever is ASHAMED of Me and My words in this adulterous and sinful generation, of him the Son of Man also will be ASHAMED when He comes in the glory of His Father with the holy angels.” (Mark 8:38).

The denial of Christ in the above verses refers to a continuing denial.  It is a permanent state of mind of the hardened unbelieving first century Jews, who rejected Jesus as the Messiah.  It is not a temporary act such as Peter’s denial when the rooster crowed. (Matt. 26:34-35).