俱舍論疏 9.97

9.97

論「已至三和至總名為觸」，此出第六觸支體也。「已至三和」，簡前位也。「未了三受因差別位」，簡後位也。此時四根初至三和位故得觸名，非由意與身此位五蘊名為觸也。「三受因差別」者，謂即三受境差別也。即火、毒等為苦因，衣、食等為樂因等。出胎已後隨性聰、昧至未了已前名之為觸，不可定其年歲。即是《婆沙》云「觸火食毒位也」，大分五歲六歲已上。

The treatise says: "Having reached the triple convergence... they are collectively named contact (sparśa)." This presents the intrinsic nature of the sixth link, sparśa. "Having reached the triple convergence" excludes the preceding state. "The state of not yet discerning the differences among the causes of the three feelings" excludes the subsequent state. At this time, because the four faculties have first reached the state of the triple convergence, it receives the name sparśa; it is not because of manas and the body that the five skandhas of this state are named sparśa. "Differences among the causes of the three feelings" means the differences among the objects of the three feelings. That is, fire, poison, and so forth are causes of pain; clothing, food, and so forth are causes of pleasure. After emerging from the womb, according to whether one's nature is sharp or dull, the period up until one discerns them is called contact; its years of age cannot be definitively fixed. This is what the Vibhāṣā calls "the state of touching fire and eating poison," roughly five or six years of age and older.