Is the Hadeeth indicating that no one will enter Paradise before the Prophet, sallallaahu ‘alayhi wa sallam, Saheeh?

All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.

This Hadeeth is not found in the books of Sunnah. However, its meaning is correct, as stated by Ibn Al-Qayyim on the authority of Al-Junayd .