>>10720821A slave serves his master forever [olam]. But only until death ends his servitude (Ex. 21:6). Olam lasted until death, it did not last forever.
Exodus 21:6 King James Version
6 Then his master shall bring him unto the judges; he shall also bring him to the door, or unto the door post; and his master shall bore his ear through with an aul; and he shall serve him for ever.
The Mosaic covenant is everlasting [olam]. But only until it vanishes away (Le. 24:8; He. 8:7-13).
Leviticus 24:8 King James Version
8 Every sabbath he shall set it in order before the Lord continually, being taken from the children of Israel by an everlasting covenant.
Hebrews 8:7-13 King James Version (KJV)
7 For if that first covenant had been faultless, then should no place have been sought for the second.
8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
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11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.