The word ratify means "to pass, or approve".
So, you're essentially asking which article of the constitution tells us how to approve the constitution and make it law.
I think what you mean is "What article tells us how to amend the constitution." To amend the constitution means to somehow change it, which has only happened 27 times.
Article #5 tells us how to amend the constitution.
amending the constitution amending the constitution
Article 5: Amending the Constitution Two Thirds of both houses
Article Five
Article V. In other words, Article 5.
article v
The Legislative Branch is created via article I of the constitution. However, the legislative branch also plays a major role in article V, which concerns amending the constitution.
article 5
Amending the Constitution
Amendment 5. Cheers!
Article V of the Constitution spells out the processes by which amendments can be proposed and ratified.
The process for amending the Constitution is described. The states are responsible for ratifying amendments.
Article III of the Constitution