بِالْمُسْتَفِيضِ مِنَ الْأَخْبَارِ
Through widely transmitted reports.
Numerous narrations from different Companions address the Prophet's intercession, the intercession of angels and believers, and the removal of people of faith from punishment. This supports the concept of mass transmission in meaning: wording may vary while a central substance appears repeatedly through different reports.
Claiming that every wording of an individual hadith is mass-transmitted is different from saying that the common theme is strongly and extensively transmitted.