In the Bible we read:
Jesus Christ the same yesterday, and to day, and for ever. (heb 13:8) (5:16) 42 see

This verse from the Bahá'í Writings describes the unchanging nature of Christ. It refers to His Divine, not human reality. [The Divine Christ] is the Word of God, the Eternal Bounty, the Holy Spirit. It has neither beginning nor end, for these things are related to the world of contingencies and not to the divine world. For God the end is the same thing as the beginning.. Therefore, the reality of prophethood, which is the Word of God and the perfect state of manifestation, did not have any beginning and will not have any end.. the Holy Reality, of which Christ says, "The Father is in the Son, has neither beginning nor end." (saq 153) (5:17) see

Although the social teachings of religion change as humanity matures-as evidenced by the fact that Christ changed certain laws and teachings-the spiritual teachings never change. For example, the teachings that we should worship God, that we should tell the truth, that sex is unlawful outside of marriage, that we should treat other people the same way that we, ourselves, would want to be treated, that we should overlook the faults of others and strive to better our own characters-these teachings will never change. However, social laws such as those relating to what day we worship, what we can or cannot eat, whether or not we fast, how we pray-these are changed according to the wisdom of God (5:19)

Bahá'u'lláh says:
This is the changeless Faith of God, eternal in the past, eternal in the future. Let him that seeketh, attain it. (gwb 136:1) (5:20) see

End of Quote