Sentence:  And quhair it be tainted that they big, and the Birdes be flowin, and the nest be funden in the Trees at <WSD>"Beltane</WSD>" the trees sal be foirfaulted to the King (bot gif they be redeemed fra him, throw them that they first perteined to) and hewin downe, and siue schillings to the King is unlaw. 
Meaning of the word marked with <WSD> tags:  The first day of May (since 1752); May Day, a Scottish quarter day, sometimes associated by Christians with the nearest Church Feast, the Invention of the Cross (May 3rd), and Whitsunday (May 15th).