'Three' in the Bible

" 'And when you have come into the land and you plant any tree for food, {you shall regard its fruit as unharvestable}; [for] three years it shall be forbidden for you; it shall not be eaten.

then I will command my blessing for you in the sixth year, so that it will make the yield for three years.

And if from {a month of age} up to {five years of age}, then your proper value shall be five shekels [of] money [for] the male, and your proper value for the female [shall be] three shekels [of] money.