大方廣佛華嚴經疏 40.19

40.19

第二結中，由般若現前故，順忍明利。言第三者，三品忍中為最上故。

In the second, the conclusion: because prajñā is present, the concordant forbearance (anulomikī kṣānti) is clear and sharp. Calling it 'the third' is because it is the supreme among the three grades of forbearance.