Example 2

Tag 01T9, permanent. Cite it as [Bourbaki, Tag 01T9].

Topologie algébrique, chapter II, § 3. Groupoïdes

Let G and $G'$ be groupoids, let $\varphi$ and $\psi$ be groupoid morphisms from G into $G'$ . The equalizer of $\varphi$ and $\psi ($ cf. II, p. 153) is a subgroupoid of G.

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.

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