«إجماع الصحابة رضي الله عنهم على حكم الحادثة نصّاً»
The Companions’ explicit agreement on the ruling of an issue that arises.
Here نصّاً (explicitly) concerns clearly stated assent by the participants, not necessarily an explicit verse of the Qur’an. The agreement is shown through positive expression rather than merely lack of objection.
It differs from the second category, in which some Companions speak and others are silent.