It had been revealed to him by the Holy Spirit that he should not see death before he had seen the Lord's Christ.{"Christ" (Greek) and "Messiah" (Hebrew) both mean "Anointed One"}
Actually, the Lord claimed the firstborn. But it came to the place were the people could redeem the firstborn, and God finally chose the Levi's. And they would then pay the Levi's for the firstborn, redeeming their firstborn for being committed for serving the Lord. But they brought the firstborn, holy to the Lord.