Main reference: Heb 8, 9
Through Moses, God said to the Hebrews (Israelites) who came out of Egypt, “If you keep my covenant, then out of all nations you will be my treasured possession. Although the whole earth is mine, you will be for me a kingdom of priests and a holy nation” (Ex 19:5-6). But they did not trust and obey God in front of the Jordan River (Ex 32; Dt 9:11-24; Heb 3).
Therefore, God said in Jeremiah 31 that he would make a new covenant because the Israelites broke the first one (Jer 31:31-32; Heb 8:7-13), and a new covenant was made through the blood of Jesus approximately 600 years later (refer to Mt 26:26-29; Lk 22:14-20; Heb 9:13-15). This new covenant was the New Testament, and the essential point of the New Testament is the promised words in the Book of Revelation. Those who keep this new covenant will have their sins forgiven and become God’s kingdom and priests and a holy nation; that is, they will be the people of Heaven (refer to Rv 1:5~6; Heb 9:24-28).
The old covenant was established through Moses, and the new covenant was established through Jesus. Today, those who keep the new covenant will receive the promised blessing. What we must trust and obey is the promised Word (prophecy) and fulfillment of the New Testament.
The events of the past (Time of Moses) are like a reflection in a mirror of that time, which reflects their own appearances in that mirror. Today, we look into a mirror of glass that is far more transparent than pure gold (refer to Rv.21:21). This mirror is the everlasting word that is like gold, and everyone will be judged according to their deeds as recorded in the Bible (Rv 20:12).