תענית ב׳:י׳ - ג׳:א׳

ואם התחילו – that they decreed these fasts earlier than this and began to fast on the trouble, even one day, and one of these days came up, we don’t halt [from fasting].

מודה הוא שאין משלימין – to fast on them the entire day, but he eats in the evening close to sunset.

וכן ט' באב שחל להיות בערב שבת – such as at the time when the Jewish court would establish [the months] through visual [sighting of the New Moon]. But he would eat in the evening near sunset because of the honor of the Sabbath, so that he would not enter the Sabbath while he is hungry. But the Halakha is not according to Rabbi Meir but rather, we complete the fast. Similarly, Tisha B’Av that occurs on a Friday, we complete the fast (Note: Today, this situation would never arise due to the fact that the first day of Passover is always the same day of the week as Passover, and the first day of Passover can never fall on a Friday, since the tine and edicts of Hillel II in the fourth century CE).

סדר תעניות האלו – that are mentioned in the chapter above, are not observed other than for the rainfall in the autumn. If the three times of the early rainfall passed, which are the third of Marcheshvan, the seventh [of Marcheshvan] and the seventeenth [of Marcheshvan] and rain did not fall, then individuals would fast, and afterwards, the community would [observe] thirteen fasts according to the order that was mentioned.

אבל – if rains fell at their appropriate time and the seeds sprouted and changed, such as in place of wheat came thorns and in place of barley came the early stages of ripening, or another change.

מתריעין עליהם מיד – with the first fast, for all the stringency related to the latter fasts are practiced immediately on the first fast.

בין גשם לגשם—between the rainfall in the autumn and the second period.

מכת בצורת – it is a sign of drought [of rain in season].