16.24 Let the scriptures be the measure Krishna speaks

And the chapter ends on an authority, which is unusual for this book.

Let the scriptures be your measure in deciding what is to be done. Knowing what they teach, act.

The Gita rarely settles a question by citation — chapter 2 was rude about people who do. Here it hands Arjuna an external standard, and the next chapter will immediately complicate it by asking what happens when faith differs.