Corollary 1
Tag 03K8, permanent. Cite it as [Bourbaki, Tag 03K8].
Theory of Sets, chapter III, § 2. Well-ordered sets
The only isomorphism of a well-ordered set E onto a segment of E is the identity mapping of E onto itself.
Put in Theorem 3.
Bourbaki sets the proof directly after the statement, and the corpus does not separate them, so what is above is the statement and its proof together.