The Mishnah commences with an account of the four beginnings of the religious and the civil year (1:1); it speaks of the four judgement-days of the pilgrim festivals and Rosh ha-Shanah (1:2); of the six months in which the messengers of the Sanhedrin announce the month (1:3); of the two months, the beginnings of which witnesses announce to the Sanhedrin even on the Sabbath (1:4), and even if the moon is visible to every one (1:5); Gamliel even sent on the Sabbath for forty pairs of witnesses from a distance (1:6); when father and son (who as relatives may otherwise not witness together) behold the new moon they must set out for the beth din (1:7), since they do not absolutely belong to those that are legally unfit for this purpose (1:8).