首楞嚴義疏注經 7.41

7.41

「從三七後，端坐安居經一百日。有利根者，不起于座得須陀洹，縱其身心聖果未成，決定自知成佛不謬。汝問道場，建立如是。」

"From after the three seven-day periods, sit upright in retreat for one hundred days. Those of sharp faculties, without rising from their seats, will attain [the stage of] srotāpanna. Even if their bodies and minds have not yet accomplished the noble fruit, they will definitely know for themselves that their attaining buddhahood is not mistaken. As for what you asked about the bodhimanda, its establishment is like this."