The Collaborative International Dictionary of English v.0.48:

Moste \Mos"te\, obs.
   imp. of Mote. --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Mot \Mot\ (m[=o]t), v. [Sing. pres. ind. Mot, Mote, Moot
   (m[=o]t), pl. Mot, Mote, Moote, pres. subj. Mote;
   imp. Moste.] [See Must, v.] [Obs.]
   May; must; might.
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         He moot as well say one word as another  --Chaucer.
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         The wordes mote be cousin to the deed.   --Chaucer.
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         Men moot [i.e., one only] give silver to the poore
         freres.                                  --Chaucer.
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   So mote it be, so be it; amen; -- a phrase in some rituals,
      as that of the Freemasons.
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