What did the 38th demand of the Magna Carta (Primary Sources) basically say

The 38th demand or clause basically says that the sovereign's (the king's) power is limited. According to this clause, nobody can be tried without the testimonial of independent witnesses. Until then, the king, as a supreme ruler, could do whatever he wanted, without providing a fair trial for the accused. Therefore, the court should now be independent and free of king's power.