Hebrew is a language that has only consonants (besides 3 silent place holders which were probably vowels at one time). Hebrew is always spoken with vowels but not always written with them. The Hebrew scriptures of the Old Testament as we have them have a very systematized vowel-pointing to indicate how to say the words, which sometimes distinguishes a word from other words.
Are the vowel points original to the Scriptures, and thus inspired and inerrant, or were they inserted to the texts in order to codify the traditionary Jewish pronunciation of the Scriptures during the Middle Ages?
The reformed orthodox of the puritan era largely held to the former; modern conservatives largely hold to the latter.
Who is right? The articles of 6 of the most important figures from history to argue the question (3 from each side) are given with helpful notes from this webmaster. Read them, or at least scan them, and find out.