Visuddhimagga IV-178

Yaṃ pana vuttaṃ ‘‘ekaṅgavippahīnaṃ duvaṅgasamannāgata’’nti, ettha pītiyā pahānavasena ekaṅgavippahīnatā veditabbā.

次说「一支舍离，二支具备」，此中以舍离于喜为一支舍离。

Ñ(IV,178): Then it was said, which abandons one factor, possesses two factors (§153): here the abandoning of the one factor should be understood as the abandoning of happiness.

Sā panesā dutiyajjhānassa vitakkavicārā viya appanākkhaṇeyeva pahīyati.

犹如第二禅的寻与伺在于安止的剎那舍断，

Ñ: But that is abandoned only at the moment of absorption, as applied thought and sustained thought are at that of the second jhāna;

Tena nassa sā pahānaṅganti vuccati.

而喜亦在第三禅的安止剎那舍离，故说喜是第三禅的舍断支。

Ñ: hence it is called its factor of abandoning.