Take the straight and narrow path and if you start to slide, give a little whistle... Give a little whistle.

11 seconds sound clip from the Pinocchio (1939) classic radio play.

You can hear this line at 00:12:59 in the radio play.

Quote context

[...]

(WHISTLES THREE TIMES)

(WHISTLES BREATHY TWICE AND CLEAR THE THIRD TIME)

- That's it! When you get in trouble and you don't know right from wrong, give a little whistle... Give a little whistle.

- When you meet temptation and the urge is very strong, give a little whistle... Give a little whistle.

- Not just a little squeak, pucker up and blow. And if your whistle's weak, yell...

- Jiminy Cricket?

- Right!

- Take the straight and narrow path and if you start to slide, give a little whistle... Give a little whistle.

- And always let your conscience be your guide. Ho, ho! And always let your conscience be your guide.

(PINOCCHIO DANCING)

- Look out, Pinoke! Don't dance on the table, you'll fall off. You'll...

- Oh, I knew it. I knew it.

[...]