瑜伽論記 16.151

16.151

言又則此在現在以過去為義者，又如現在一念意根緣過未境，根入過去當境不起，則名過去，緣過去緣未來，現在現在為義，有色苦。

Regarding 'and again, being in the present, it has the past as its object': furthermore, if a single moment of the mind faculty in the present takes a past or future object, and the faculty enters the past while the corresponding object does not arise, it is called past, taking the past or future as its object; and in the present, having the present as its object applies to the physical faculties and suffering.