There were 10 different miracles that happened in the Beit HaMikdash that benefited our forefathers. We don't see mention of them in the Tanakh, but we do have a tradition that they happened as a machloket (dispute) and as Mishnah, talking about the first Beit HaMikdash or also the second Beit HaMikdash. But we'll go through the 10 different miracles that they personally benefited from, the people benefited from. Of course, there were other miracles in the Beit HaMikdash, but we're only mentioning the ones that were directly beneficial to people.
Number one: A woman did not miscarry because of the smell of the sacrificial meat being roasted. The meat of the Kodshei Kodashim (most holy offerings) was roasted in the courtyard of the Beit HaMikdash, and the Kohanim (priests) ate it there. Some parts of the animal were burnt on the Mizbeach (altar), and that smell went all the way around the Beit HaMikdash. That type of smell could give a woman such a strong desire to taste some of that meat that she would miscarry if she didn't have the ability to have it. But a miracle happened, and no woman ever miscarried for that reason.
Number two: The sacrificial meat never became spoiled, even though certain types of korbanot (offerings) could be left exposed for two days and eaten for two days in warm weather.
Number three: A fly was never seen in the butchering area of the Beit HaMikdash. Flies are usually attracted to blood and to all different parts of the animals, and they would usually go there. But in the part of the Beit HaMikdash where the processing of the meat would happen, there were no flies whatsoever, which is a sign of the miracle of Hashem. He wanted to make the area pleasant for the Kohanim.
Number four: A discharge that would have made the Kohen Tameh (ritually impure) and unable to perform the Yom Kippur service would have meant that his deputy had to step in for him. That never happened: he never became a Baal Keri (one with a seminal discharge) on Yom Kippur. He became Tameh from other reasons on Yom Kippur, but this type of Tumah (ritual impurity), a seminal discharge, would have been embarrassing to the Kohen Gadol (High Priest), but it never happened.
Number five: A fly was never seen in the butchering area of the Beit HaMikdash. A rain never put out the fire on the piles of wood that were on the Mizbeach, even though the Mizbeach was exposed to the elements and rain fell upon it. A miracle happened, and rain never put out the fire.
Number six: No wind overcame the column of smoke that came up from the Mizbeach, in order to keep the area around the Mizbeach pleasant. Where people were, Hashem made a miracle and made the smoke rise only upwards, not to the side, even on very windy days.
Number seven: No disqualification was found in the Korban HaOmer or the Shtei HaLechem or the Lechem HaPanim. This was a big Hiddush (novel insight), because any type of disqualification would make them problematic. They could come in contact with a source of Tumah, be removed from their proper location, be prepared by a Kohen who wasn't qualified, or be prepared improperly; anything could disqualify them. When they were disqualified, there was no way of redoing them because of how they had to be prepared. They had to be done at a certain time and offered at a certain time. So if it was messed up, if it became Tameh, there was no redoing it. So the big miracle here was that they never became disqualified.
Number eight: Omdim Tzefufim U'mishtachavim Revachim. Very famously, the people stood in the Beit HaMikdash; they were pressed together, but when they bowed down, they stretched themselves out on the floor. There was plenty of space all over, especially on occasions like the Regalim (pilgrimage festivals), Pesach, Shavuot, and Sukkot, or on Yom Kippur. The courtyard of the Beit HaMikdash was full of people who came for Tefillot (prayers) and to bring Korbanot, and there was no room to move whatsoever. But when it came time for them to bow and the Shem HaMephorash (Explicit Name) was pronounced on Yom Kippur, a miracle happened, and the entire area became open and everybody had room to bow. But not only did they have room; they had their own Arba Amot (four cubits), their own four amot of space, where another person wouldn't hear their own Tefillot. A big miracle happened at that time.
Number nine: A snake or scorpion never harmed anybody in Yerushalayim whatsoever. A snake or a scorpion never killed anybody. It means that they didn't kill anybody with a bite. That was a miracle in order to keep a certain feeling of godliness in Yerushalayim. No tragedy like that happened. And no one ever told his friend, “The place where I sleep in Yerushalayim is too small for me.” There were tons of people who went up for the regalim of Pesach, Shavuot, and Sukkot, and everyone needed a place to stay. No matter what, it didn't matter how many people were there; there was always room for accommodations. People always found a spot to stay. No one ever felt that they were stuffed. People felt very comfortable in the holy city of Yerushalayim.