I was playing with a DM that says the rules state that you cannot have a 1st-level character with an ability score above 18. I didn't want to argue so I made it work. I cannot find that rule anywhere.

We are using the "roll 4d6 for each ability score, drop the lowest" method of generating ability scores.

**Is there a rule that states a 1st-level character cannot have an ability score above 18?**