Beis Shammai say: We may not move the ladder from one dovecote to another, but may lean it from one window to another. But Beis Hillel permit it. Beis Shammai say: One should not take [doves out of the dovecote on Yom Tov] unless one had held them before Yom Tov. But Beis Hillel say: He may stand and say, ‘‘This one and that one I will take.’’