Exodus 27:2

27:2 You are to make its four horns on its four corners; its horns will be part of it, and you are to overlay it with bronze.

Exodus 38:2

38:2 He made its horns on its four corners; its horns were part of it, and he overlaid it with bronze.

Exodus 38:5

38:5 He cast four rings for the four corners of the bronze grating, to provide places for the poles.