Who did Sufis believe is the chief prophet?

According to Sufis, MUHAMMAD is the chief prophet.

What makes Sufism distinct from other forms of Islam is that Sufi masters were mostly concentrating on the Muhammadan Truth's pure spiritual dimension. They sought to reveal the essence of humanity's being, the real nature of existence, and the inner dynamics of humanity and the cosmos by calling attention to the reality of that which lies beneath and beyond their outer dimension. Adding to Qur'anic commentaries, narrations of Traditionalists, and deductions of legal scholars, Sufi masters developed their ways through asceticism, spirituality, and self-purification in short, their practice and experience of religion.