首楞嚴義疏注經 6.161

6.161

耳聞圓觀，頂觸智光，觀音三昧一時同獲，此則二十四聖同會觀音一門，皆得名為金剛三昧也。

The ears hearing the perfect contemplation and the crowns touched by the light of wisdom, they obtained the Avalokiteśvara samādhi together at the same time. This means that the twenty-four sages merged together into the single gate of Avalokiteśvara, and all obtained what is called the vajra samādhi.