Let me give you some money.

2 seconds sound clip from the Back to the Future Part II movie soundboard.

You can hear this line at 01:03:47.207 in the Blu-ray version of the movie.

Quote context

[...]

- That way, we don't risk anyone else stealing the time machine, and I won't risk accidentally running into my other self.

- Other self?

- Yes. There are now two of me here, and there are two of you here.

- The other me is the Dr. Emmett Brown from 1955, the younger me that helps the other you get back to 1985.

- Remember the lightning bolt at the clock tower?

- Yeah.

- That event doesn't happen until tonight, so you must be very careful not to run into your other self.

- Let me give you some money.

- I have to be prepared for all monetary possibilities.

- Get yourself some '50s clothes.

- Check, Doc.

- Something inconspicuous!

- Doc. Come in, Doc. This is Marty. Over.

[...]