There were five events that happened to our ancestors on the seventeenth of Tammuz and five on the ninth of Av...On the ninth of Av it was decreed that our ancestors should not enter the land, The Temple was destroyed the first and the second time, Betar was captured, And the city was plowed up. When Av enters, they limit their rejoicing.

The Sages taught: All mitzvot practiced by a mourner are likewise practiced on the Ninth of Av: It is prohibited to engage in eating, and in drinking, and in smearing oil on one’s body, and in wearing shoes, and in conjugal relations. It is prohibited to read from the Torah, from the Prophets, and from the Writings, or to study from the Mishna, from the Gemara, and from midrash, and from collections of halakhot, and from collections of aggadot. However, one may read from a place in the Bible that he is unaccustomed to reading, as it will be difficult for him and he will not derive pleasure from it, and he may likewise study from a place of the Talmud that he is unaccustomed to studying. And one may read from the book of Lamentations; from the book of Job; and from the evil matters in Jeremiah, i.e., his prophecies of doom. And schoolchildren interrupt their studies for the day because it is stated: “The precepts of the Lord are right, rejoicing the heart” (Psalms 19:9). Rabbi Yehuda says: One may not even read from a place in the Bible that he is unaccustomed to reading, nor may one study from a place of the Talmud that he is unaccustomed to studying. However, one may read from Job, and from Lamentations, and from the evil matters of Jeremiah. And schoolchildren interrupt their studies on that day because it is stated: “The precepts of the Lord are right, rejoicing the heart” (Psalms 19:9).

Alas! Lonely sits the city Once great with people! She that was great among nations Is become like a widow; The princess among states Is become a thrall.

Remember, LORD, what has occurred to us, Alas! Look and see our disgrace. Alas! what has occurred to us. Our property has been handed over to strangers, Alas! Our homes to foreigners. Alas! what has occurred to us. We have become orphans without a father. Alas! Our mothers mourn in the month of Av. Alas! what has occurred to us.

Due to what reason was the First Temple destroyed? It was destroyed due to the fact that there were three matters that existed in the First Temple: Idol worship, forbidden sexual relations, and bloodshed. Idol worship, as it is written: “The bed is too short for stretching [mehistare’a], and the cover is too narrow for gathering” (Isaiah 28:20).However, considering that the people during the Second Temple period were engaged in Torah study, observance of mitzvot, and acts of kindness, and that they did not perform the sinful acts that were performed in the First Temple, why was the Second Temple destroyed? It was destroyed due to the fact that there was wanton hatred during that period. This comes to teach you that the sin of wanton hatred is equivalent to the three severe transgressions: Idol worship, forbidden sexual relations and bloodshed.

The Gemara explains: Jerusalem was destroyed on account of Kamtza and bar Kamtza. This is as there was a certain man whose friend was named Kamtza and whose enemy was named bar Kamtza. He once made a large feast and said to his servant: Go bring me my friend Kamtza. The servant went and mistakenly brought him his enemy bar Kamtza. The host said to him: No, you must leave. Bar Kamtza said to him: I will give you money for half of the feast; just do not send me away. The host said to him: No, you must leave. Bar Kamtza then said to him: I will give you money for the entire feast; just let me stay. The host said to him: No, you must leave. Finally, the host took bar Kamtza by his hand, stood him up, and took him out. After having been cast out from the feast, bar Kamtza said to himself: Since the Sages were sitting there and did not protest the actions of the host, although they saw how he humiliated me, learn from it that they were content with what he did. I will therefore go and inform [eikhul kurtza] against them to the king. He went and said to the emperor: The Jews have rebelled against you. The emperor said to him: Who says that this is the case? Bar Kamtza said to him: Go and test them; send them an offering to be brought in honor of the government, and see whether they will sacrifice it. The emperor went and sent with him a choice three-year-old calf. While bar Kamtza was coming with the calf to the Temple, he made a blemish on the calf’s upper lip. And some say he made the blemish on its eyelids, a place where according to us, i.e., halakha, it is a blemish, but according to them, gentile rules for their offerings, it is not a blemish. Therefore, when bar Kamtza brought the animal to the Temple, the priests would not sacrifice it on the altar since it was blemished, but they also could not explain this satisfactorily to the gentile authorities, who did not consider it to be blemished. The blemish notwithstanding, the Sages thought to sacrifice the animal as an offering due to the imperative to maintain peace with the government. Rabbi Zekharya ben Avkolas said to them: If the priests do that, people will say that blemished animals may be sacrificed as offerings on the altar. The Sages said: If we do not sacrifice it, then we must prevent bar Kamtza from reporting this to the emperor. The Sages thought to kill him so that he would not go and speak against them. Rabbi Zekharya said to them: If you kill him, people will say that one who makes a blemish on sacrificial animals is to be killed. As a result, they did nothing, bar Kamtza’s slander was accepted by the authorities, and consequently the war between the Jews and the Romans began. Rabbi Yoḥanan says: The excessive humility of Rabbi Zekharya ben Avkolas destroyed our Temple, burned our Sanctuary, and exiled us from our land.

And from the day that the wicked kingdom, i.e., Rome, spread, who decree evil and harsh decrees upon us, and nullify Torah study and the performance of mitzvot for us, and do not allow us to enter the celebration of the first week of a son, i.e., circumcision, and some say: To enter the celebration of the salvation of a firstborn son; by right we should each decree upon ourselves not to marry a woman and not to produce offspring, and it will turn out that the descendants of Abraham our forefather will cease to exist on their own, rather than being forced into a situation where there are sons who are not circumcised. But concerning a situation such as this, the following principle is applied: Leave the Jews alone and do not impose decrees by which they cannot abide. It is better that they be unwitting sinners, who do not know that what they are doing is improper considering the circumstances, and not be intentional wrongdoers, who marry and procreate despite knowing that they should not.