Could you tell me what this conversation is about?
Sure.
The OT specifically says that "leaven/yeast" was not to be used either for animal sacrifices or for cereal offerings because when it is mixed with flour and water it makes it "rise." It is forbidden because God gave Moses instructions to avoid yeast during the first Passover in Egypt and remove all yeast while celebrating Passover in the future.
Exodus 13:3 "And Moses said to the people, "Remember this day, in which you came out from Egypt, out of the house of bondage, for by strength of hand the LORD brought you out from this place; no leavened bread shall be eaten.
But Leviticus encouraged "yeast" to be used in cereal offerings as
"first fruits."
Leviticus 7:13 - "...With the sacrifice of his peace offerings for thanksgiving he shall bring his offering with cakes of leavened bread (with yeast).
Leviticus 23:17 - "You shall bring from your dwellings two loaves of bread to be waved, made of two tenths of an ephah; they shall be of fine flour, they shall be baked with leaven, as first fruits to the LORD. 18) And you shall present with the bread seven lambs a year old without blemish, and one young bull, and two rams; they shall be a burnt offering to the LORD, with their cereal offering and their drink offerings, an offering by fire, a pleasing odor to the LORD. 19) And you shall offer one male goat for a sin offering, and two male lambs a year old as a sacrifice of peace offerings. 20) And the priest shall wave them with the bread of the first fruits as a wave offering before the LORD, with the two lambs; they shall be holy to the LORD for the priest. 21)And you shall make proclamation on the same day; you shall hold a holy convocation; you shall do no laborious work: it is a statute for ever in all your dwellings throughout your generations."
Also there is Amos' prophesy which says:
Amos 4:5 - "...offer a sacrifice of thanksgiving of that which is leavened (with yeast), and proclaim freewill offerings, publish them; for so you love to do, O people of Israel!" says the Lord GOD."
Why are those who are concerned about what "type" of bread Jesus used when He instituted the New Covenant during the Last Supper? It seems as though those who still adhere to the OT laws in regards to offerings believe that those "laws" should still be in effect in the NT of which I disagree with that line of thinking.
The reason I disagree with it is because the NT uses the Greek word "artos" which translates into English as indication of "leavened bread"; not the "unleavened bread" of the OT. When Jesus instituted the New Covenant He replaced those OT laws of animal sacrifices with our "leavened bread" and "wine" (or grape juice).
Those who disagree claim that because that new "communion" was to be a part of the New Covenant it was instituted during the OT period because Jesus had not died and been resurrected at that point and therefore the bread they ate
"should still be the old UNleavened bread of the OT" even though the word
"unleavened" is never used again in the entire NT unless it refers to the festival titles because Jesus is replacing them within the New Covenant at the Last Supper as you can see from the following NT verses...
1Co 11:23-24 - For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, and when he had given thanks, he broke it, and said, "This is my body which is for you. Do this in remembrance of me."
This is a sampling out of 77 NT verses that use the word "artos/leavened bread. (Mt 26:17, 26, Mark 14:22, Luke 4:3-4, Luke 22:19, 24:30,35, John 6:32-33, 35, 51, 1 Cor 11:26-28, Heb 9:2)
In 1Cor. verses 23-24, Jesus used the Greek word "
artos" for the word "
bread" above which indicates that "
leaven/yeast" was used in the bread.
Mat 12:4 - " how [David] entered the house of God and ate the bread of the Presence, which it was not lawful for him to eat nor for those who were with him, but only for the priests?
So, why is that important? Because Christ arose from the dead and our raised "Wonder Bread" can be used instead of those "paper-tasting wafers" the Catholics use without committing "a sin".
There is an excellent website that you should check out at:
https://jewsforjesus.org/publications/newsletter/newsletter-mar-1997/first-fruits-in-the-bible-what-does-it-have-to-do-with-resurrection-from-the-dead/