Bava Batra

The appointed seasons of the Lord, were said [but] the weekly Sabbath  was not said [unto them].  Ben Azzai said: The appointed Seasons of the Lord were said, [but] the annulment of vows was not said [unto them]. R. Jose b. Nathan  studied this Baraitha and did not know [how] to explain it. Going after R. Shesheth to Nehardea and not finding him, he followed him to Mahuza [where] he found him. He said unto him: What [is meant by] 'the appointed seasons of the Lord were said [but] the weekly Sabbath,  was not said [unto them]'? [The other] replied unto him: [This is the meaning:] The appointed seasons of the Lord  require a proclamation by a court  [but] the weekly Sabbath does not require proclamation by a court;  for, it might have been assumed, since it  was written  near the appointed seasons,  that it required a proclamation by the court as [do] the appointed seasons, [this,]  therefore, had to be taught. What [is meant by] 'the appointed seasons of the Lord were said [but] the annulment of vows was not said [unto them]'? — The [proclamation of the] appointed seasons of the Lord requires [a court of three] qualified mem  [but] the annulment of vows does not require [three] qualified men.  But, surely, it is written the heads of the tribes!  — R. Hisda replied in the name of R. Johanan: [The text implies that annulment of vows may be performed] by one qualified man. We learnt elsewhere:  R. Simeon b. Gamaliel said: Israel had no [other] festive days like the fifteenth of Ab and the Day of Atonement on which the daughters of Jerusalem went out in white garments, borrowed [for the occasion], so as not to shame those who possessed none [of their own]. One well understands why the Day of Atonement [should be such a festive occasion for it is] a day of pardon and forgiveness,  [and it is also] a day on which the second Tabies  were given, but what is [the importance of] the fifteenth of Ab? — Rab Judah said in the name of Samuel: [It was] the day on which the tribes were allowed to intermarry with one another.  What was their exposition?  — This is the thing  [implies] this thing shall only apply to this generation.  Rabbah b. Bar Hana said in the name of R. Johanan: [It was] the day on which the tribe of Benjamin was allowed to enter the congregation. [This was for a time prohibited], for it is written, Now the men of Israel had sworn in Mizpah saying: 'There shall not any of us give his daughter unto Benjamin to wife.'  What was their exposition?  — 'Of us,'  but not of our children.  R. Dimi b. Joseph said in the name of R. Nahman: [It was] the day on which the dying in  the wilderness had ceased;  for a Master said: Before the dying in the wilderness had ceased