ZachZ asked that I post this question here. The question was originally posed to the Christian site and, so far, has received no resolution.

Any help would be appreciated.

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Exodus 20:2-17 lists the commandments that are accepted today, but Moses is repeating to the people what god told him. They are not written down.

Some time later, Moses goes back to God and gets the stone tablets. Exodus 31:18. But, when he came down, the people were busy building a golden calf (I know the feeling, turn your back for one minute) and he smashed the tablets... Exodus 31:19. The word commandment hasn't been mentioned to this point. In the first instance, these were words that god "spake". In the second, the words are called "testimony".

Moses goes back a third time and when he returns with the new tablets, the term "10 commandments" is finally mentioned. Exodus 34:28. This time, though, we have a different set of commandments.

They are (Exodus 34: 13-28):

Thou shall worship no other god.
Thou shall make thee no molten gods.
The feast of unleavened bread shall be kept.
Six days shalt thou work, but on the seventh, thou shalt rest.
Thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end.
Thrice in a year shall all your men children appear before the Lord God.
Thy shalt not offer the blood of my sacrifice with leaven.
Neither shall the sacrifice of the feast of passover be left unto the morning.
The first of the firstfruits of thy land thou shalt being unto the house of the Lord thy God.
Thou shalt not seethe a kid in his mother's milk.

Appears we Christians are missing out on a number of feast opportunities.

What did I miss?