When we find the singing bush, we say the magic chant, each fire one shot in the air, and that will summon the invisible swordsman, and he will then show us the way to El Guapo's.
11 seconds sound clip from the Three Amigos (1986) movie soundboard.
You can hear this line at 00:54:06.126 in the Blu-ray version of the movie.
Quote context
[...]
- Great job catching the food, Ned.
- How do you like your bat, Dusty?
- How far do you think we rode before we had to go back and get directions?
- Ned, read those instructions again.
- All right. We go east through the desert until we come to the singing bush.
- Look at the little fella. He's tuckered out already.
- Oh. I've never slept outside before.
- Take it easy. Take it easy. Dusty...
[...]