瑜伽論記 15.328

15.328

色界，言已得色界對治，若入彼定者，身在欲界得無色定及入彼定，是第一時但成色界有漏種子也。

Regarding the form realm, stating that one has already attained the antidote to the form realm and enters that absorption refers to the first period: while one's body is in the desire realm, one attains formless absorption and enters that absorption, wherein one only establishes the contaminated seeds of the form realm.