[If] a bull is a muad toward its kind, but not a muad toward those not of its kind; a muad toward man, but not a muad toward beasts; [or] a muad toward small ones, but not a muad toward large ones —- [for] those toward which it is a muad, [its owner] pays the full damages; [for] those toward which it is not a muad, he pays half the damages.  They said before R' Yehudah: [What] if it was a muad for Sabbaths, and not a muad for weekdays? He said to them: For Sabbaths he pays the full damages; for weekdays he pays half the damages. When does it become a tam? When it refrains for three Sabbath days.