成唯識論述記 4.618

4.618

述曰：不諍觸體別有不有，但總令有三和合因。然彼所許，以經中言三和合觸故令定有。

The Commentary states: It does not dispute whether the substance of contact exists separately or not, but generally requires that the cause of the coming together of the three be present. However, according to what he accepts, because the sūtra speaks of contact being the coming together of the three, it must definitely exist.